Correction: An eagle-eyed viewer pointed out a small error when we described the old definition of a kilogram. It should have been "the weight of water equal to the cube of a tenth part of the metre"…not "the hundredth part." Otherwise, you'd be getting a gram, not a kilogram. Good catch…and a good argument for the metric system!
Isn't that a thousandth part of a cubic metre? Since 1 cubic metre equals 1000 litres of pure water. 1 litre of pure water makes 1 kilogram by the older definition.
@@lulube11e111 Well al Imperial system units defined using Metric system units which currently after kg, all based on fundamentals of nature and completely independent from time, material and place.
Yeah, but the problem with the imperial system is working with Newtons, Joules, Watts etc, these units are based on the metric system but are still used in the imperial
It’s incredibly expensive, most people here prefer the metric system too. It’s just the fact that most of our laws and infrastructure are based on the customary system.
I wish America would just adjust to the metric system. It would solve a lot of problems for me so I know that the unit of measurement won’t change when I go to another country
I've heard stories of a plane nearly crashing because the same number was kept but in different units (for fuel). Another one I'm less sure of was a shuttle exploding due to different measures again.
@@lancelindlelee7256 There was an orbiter that exploded, wasting 125 million USD. It was due to two teams using different units for their calculations.
It wasn't used to calculate the value of Planck's constant, it was to count the number of silicon 28 atoms it takes to be exactly 1 kilogram it was to redefine the Avagadro's number. Please edit the comment its frustrating.
Are British people aware that stones and miles are not part of the metric system? Because I think there's a confusion here. They dont use it for everything.
@@rebeccaanderson5626 I don’t know 🤷🏽♀️ why do Americans? I’m a scientist so at work I strictly use metric but I buy milk or beer in pints, use miles when I’m driving, I measure my height in ft and inches and weigh myself in stones because if I want to tell my friend how much I weigh they won’t have any idea what I mean if I tell them in Kilos
Actually, the British would typically say she's 10 stone, 10. (a stone is 14 pounds, and the unlabeled unit to follow is the leftover 10 pounds.) That's one of several contexts where the metric system was unable to displace the imperial system in the UK. (Their highway signage often list distances in furlongs and miles too.)
I was just about to ask you for this video. Because this is THE most important event of 2018, touching everything we do and also touching everyone in this planet in one way or the other. Thanks! And well done!
The seemingly random numbers come from the need to redefining the SI units. One tenth of a million of a meridian is nice and pretty. But when they decided to use light speed for more precision (since it's a universal constant), the conversion had to adopt those numbers.
5 лет назад
@@jmiquelmb It's not a universal constant. The speed of light isn't a constant at all. They showed that in 2015 already.
The mile was defined as 8 furlongs. A furlong was the length of a furrow a team of oxen could plow in a day. A gallon is of Roman origin and it meant "a pailful", as in, 'grab a pail full of water' A foot was the size of the Kings foot a pound came from the word "libra" (lb) and was equal to 7000 grains
@@lumschente Not technically. That act just allowed the metric system to be used, it didn't actually force anyone to convert. Unless at a bare minimum it becomes mandatory that anything government issued or legally binding be in metric only, it can't really be called a conversion
"We don't agree on a unit of measurement yet" aka "the US doesn't want to drop the archaic english system yet like the rest of the world did when we decided to go metric "
How can you claim that everybody in the world can now access the exact kilo, if you need a super expensive, extremely intricate machine to measure Planck's constant?
They probably wrote down the data results somewhere on some document and published it world wide. Internet included. So there's no need to make that super expensive, extremely intricate machine yourself. It's common sense really. I mean, if everyone had to make that machine themselves. They wouldn't have voted for the change. How did you come to that conclusion?
Bugler55 Actually no, only the second is derived from the Caesium Atom. In this case the "hyperfine transition frequency caesium atom" So it's a natural phenomena related to the ceasium atom rather than the atom itself. all the rest are based off of other natural phenomena as can be seen in the new system of units as shown here imgur.com/gallery/FAUdZg5
It's going to take many many years even the next couple of generations are unlikely to see it since it is a building block the country is based especially after the industrial revolution which means it would take a painfully large amount of money to change.
40 years ago when the U.S. attempted a move to metric, it was fought by parents unwilling to learn conversions. Today, they carry cellphones that can do the maths conveniently enough. It would be fought by nationalisit's fear of globalism now. Perhaps next administration.
@@evilotto9200 it's never gonna happen even if we wanted to it's too expensive if it was gonna happen it had to happen during the industrial revolution.
bro, its easy. Just take a uniform object of non-negligible falling at terminal velocity, and set the drag force equal to the weight. Then, in the force of gravity formula, cancel out mass of object one from both sides, giving you acceleration of gravity equals the gravitational constant times the mass of the Earth all over the total altitude squared, and plug in the gravitational acceleration to the drag force. Next, take rho to equal mass of the object over volume in the drag force equation, and plug in the numerical value of the non-changing drag coefficient of the object's shape. Then, isolate the mass of the object from the rest of the equation. It's simple! Equations: ΣF_y = F_D - W = 0 F_D = W 1/2 ϱ C A v^2 = mg (1) F_g = mg = (GMm)/r^2 g = (GM)/r^2 (2) Plug (2) into (1): 1/2 ϱ C A v^2 = m ((GM)/r^2) (ϱ C A v^2) / (2 ((GM)/r^2) ) = m Mass = Rho * Drag Coefficient * Surface Area * Terminal Velocity squared all over 2 Gravitational Constant * Mass of Earth divided by total Altitude squared told you,, it's easy
I have seen the “ French Revolution” standard kilogram in a museum. It was presented alongside the standard metre which had the year “1799” inscribed on it.
well it will still stay around since it has been measured and documented for so long Scientists are gonna continue measure it and it's siblings for years to come for research. Long live Le Grande K.
@@CharDhue you have to go back to electron charge. Electron charge defines current which define voltage. Voltage and current define power and power defines torque. Meter and second is also involve. To define voltage you need a current and distance. To define current you need charge and time. Time is defined by atomic vibration and distance is define by speed of light constant.
Astir01's answer is very wrong! For starters, [J*s] is not the unit of torque, [N*m] is. Also, how long is that beam supposed to be? But even with a unit like [N * m] in there, you can't just assume that it's necessarily about torque, especially when talking about fundamental constants. Instead, take a look at the _definitions_ (not measurements) of various physical constants described on this card (the link is from one of the other comments): pbs.twimg.com/media/DsOFIXxXoAEXZJN.jpg For the definition of [kg], we need to consider Planck's constant h = 6.62607015 * 10^-34 [J * s], the speed of light c = 299792458 [m / s] and the transition frequency of a Caesium atom nuCs = 9192631779 [Hz] Now we substitue the abbreviated units by proper ones [J * s] = [kg * m^2 / s] and [Hz] = [1 / s]. Now we can construct a quantity that has only units of mass by cancelling all other units in Planck's constant: nuCs * h / c^2 = 9192631779 * 6.62607015 * 10^-34 / 299792458^2 [kg] which is equivalent to 1 [kg] = nuCs * h / c^2 * 299792458^2 / (9192631779 * 6.62607015 * 10^-34). So any alien civilization just needs to make machines to determine these constants in whatever alien units they like, and they can convert it to our units with these definitions. The same can be done for the other SI units as well.
Crazy to see how much works goes into making sure 1kg is actually 1kg and not 1.001kg or something. But it probably makes perfect sense. Like they said with the eyelash example
Niggachu no. They deviate from the exact definition of a kiliogram which is 1.000000... kg, whereas a physical constant will be like 0.999999...0 kg, due to decay. Everything eventually decays radioactively, as well as react with the environment and hence changes the mass
Plenty of people in the UK still use the old imperial measurements in part. You buy pints in pubs and even young people understand miles better than kilometres.
Let me see. (takes the kilogram) Alas, poor Kilogram! I knew him, Horatio, a mass of finite jest, of most excellent fancy. He hath weighed me on his balance a thousand times, and now, how abhorred in my imagination it is!
Metric is so much easier to use since it's based on 10. We in the USA think it's sooo hard to have to use it because we are not raised on it and the FPS (Foot-Pound-Second) system is so very ingrained in us. If we had been raised in the metric system and someone tried to get us to convert to the FPS system, we would think they were crazy. And we would be right. It's an ad-hoc system based on arbitrary standards. The one thing that would have been nice though is if the founder(s) of the metric system standards had made the meter to the same standard as the yard. They could have. All they would have had to do is adjust the millimeter slightly to make it all work out. That, at least, would have made the conversion of distance much easier to do in your head. But they didn't consult me, so here we are.
What is the UK guy on saying we use metric for everything? We weigh ourselves in stones and pounds we use Miles for distances and buy milk in pints. We also use the metric system for various things but that’s been a slow change across my life and I’m about the same age as that guy
I personally haven't had a need to learn metric yet. For the few times I'm presented with something only listed in metric, I just ask my phone to convert the metric unit to something useful. Usually that's only when I'm traveling outside the US, but even then I often see friendly pounds, feet or gallons in small print next to metric.
Correction: An eagle-eyed viewer pointed out a small error when we described the old definition of a kilogram. It should have been "the weight of water equal to the cube of a tenth part of the metre"…not "the hundredth part." Otherwise, you'd be getting a gram, not a kilogram. Good catch…and a good argument for the metric system!
Isn't that a thousandth part of a cubic metre?
Since 1 cubic metre equals 1000 litres of pure water. 1 litre of pure water makes 1 kilogram by the older definition.
U can edit videos now
Meter*
What a nerd. (Good on you tho)
why didn't you guy take the temperature of water into account? water had to be at 4 degrees C. Please provide the right fact you had two chances
It's also worth mentioning that the US Pound is defined by the Kilogram via NIST.
Miles are also defined by meters
@@lulube11e111 Well al Imperial system units defined using Metric system units which currently after kg, all based on fundamentals of nature and completely independent from time, material and place.
Yeah, but the problem with the imperial system is working with Newtons, Joules, Watts etc, these units are based on the metric system but are still used in the imperial
@@AliceTheSpider It is still dependent on time as Plancks constant is. Otherwise, the new kilogram wouldn't have been redefined as it is.
@@cristobalgarces1675 plank constantly doesn't have a time dependency, and new kilogram is the one defined by that which is what I am referring to
but steel is heavier than feathers
umami umami proof
We truly are the smartest nation on earth
But they're both a kilogramme
kilodamme
@@Bathing.in.Emptiness yes sir.
Dammit now I have to re-weigh all these kilos of cocaine
el chapo
Rr
Do it quicker. If they find out you hide 1 eyelash of cocaine less, you will be in trouble
we all agree on a unit of measurement, just america dont......
#thanksobama
@@MindfulProgramming uhh that's a joke right? The imperial system has been in place for ages. Oof I can't tell with comments anymore
@@tajwarba 😂 ye
and Liberia and Burma
Bryce Bacon imperial system is defined by the metric system
Is no one going to talk about how that guy just tattooed Planck's constant on his arm?
worth it.
That's one of the coolest tattoos I have seen. Plus you have the constant for exams
Ikr that was really something 😂
and the guy who plucked an eyelash for the video
The team of people that made this change all got the same tattoo to celebrate the achievement
Is it just me or does anyone else want that card from 2:14 (a really nice person in the comments remade it so go have a look)
I was just about to ask if anyone know where to find that card?
Can't find it anywhere
Yes please
I was just about to write this
i was about to ask the same.
_If the US switched over to the metric system, there would be _*_mass confusion_*
Lol good one
The us switched to the metric system, but allowed the usage of the old system.
en.m.wikipedia.org/wiki/Metric_Conversion_Act
+Nils Matt Oh my god what a shocking revelation! No! I can’t go on in a world where we don’t use the customary system! I have to kill myself now!
There is mass confusing because the US uses the metric system
should've done it back when it was easy
The Kilogram isn't changing, it just got defined!
So the definition changed...
redefined*
Please U.S. just get into the metric system. You will solve a lot of problems.
It’s incredibly expensive, most people here prefer the metric system too. It’s just the fact that most of our laws and infrastructure are based on the customary system.
I wish America would just adjust to the metric system. It would solve a lot of problems for me so I know that the unit of measurement won’t change when I go to another country
Clarence Royandoyan Yes, but there are more people in America than 1 person, more than you.
I've heard stories of a plane nearly crashing because the same number was kept but in different units (for fuel). Another one I'm less sure of was a shuttle exploding due to different measures again.
@@lancelindlelee7256 There was an orbiter that exploded, wasting 125 million USD. It was due to two teams using different units for their calculations.
"we don't really agree" ... Only the US*, basically all the world uses metric.
Mozart Liessi we are special and leaders. ;)
Andriod Khan Which ironically K20 is used for pounds
@@andriod8014 yeah yeah yeah
You and Myanmar..
@@andriod8014 Leaders in overcomplicated systems
I don't know why but i am so touched watching all the scientist from all nations agreed about the definition and applaud 😭
I want to ask where could I get the card for the new international system of units
Idk all I can find is different aspect ratios of business cards. Why is that such a thing?
You could just get a screenshot
Can you make the measurement from the card?
Google it ?
I don't know but I can tell you where you can't get it. From those slow americans.
5:06 😨😨😨 OH GOD WHY.
Probably due to radioactive decay 🤔
@@pranavaramanbms1609 lmaoo she was asking why they showed the clip of an eyelash being picked out, not why the prototype kilogram lost mass
In the name of Science 😥
You never done that in front of the mirror ?
How'd you get that SI unit card? Where can i buy it?
I came to the comments just for this question
yo i know right that was pretty cool but i think it was only given to those who attended the event
imgur.com/gallery/FAUdZg5 i made it in photoshop
@@Aaron-jj9no thanks
There's also the most round object in the world which was also used to calculate plank's constant.
It's Planck
It wasn't used to calculate the value of Planck's constant, it was to count the number of silicon 28 atoms it takes to be exactly 1 kilogram it was to redefine the Avagadro's number. Please edit the comment its frustrating.
Are British people aware that stones and miles are not part of the metric system? Because I think there's a confusion here. They dont use it for everything.
Yes we are - also we don’t really use stones, the only non metric units we use are miles and feet (and pints for beer 🍺 😉)
I was thinking that. The UK guy is high if he thinks we use metric for everything. The rest of us know we don’t 😂
Yeah, e.g using miles instead of kilometres.
@@Rin-ef2tp why do you cling onto a stupid and unreliable unit
@@rebeccaanderson5626 I don’t know 🤷🏽♀️ why do Americans? I’m a scientist so at work I strictly use metric but I buy milk or beer in pints, use miles when I’m driving, I measure my height in ft and inches and weigh myself in stones because if I want to tell my friend how much I weigh they won’t have any idea what I mean if I tell them in Kilos
Am I the only one who had to laugh when Herr Schlamminger said that the US got Number 4 and 20?
Nice
@@azmanabdula Nice
Yes, yes you are
... And a number 6 with extra dip.
@@jakobrmh Do you think anyone gets it?
(420)
What time is it?
Are you sad to see the old kilogram go?
Happy to see that we go further towards perfection good to see the progress we are making
Ver.....itasium???
no..... i mean why?
Yep
@Till Schwarz By that logic wouldn't that make you and anyone else that has that idea just as ignorant? 😉
Wishing everyone a beautiful and safe holiday. Merry christmas
Thanks. Merry Xmas to you too!
wish back to u Merry christmas
Thankyou, merry xmas man
I don't celebrate it...
@@at2t1 Thog don't care
Amaracan : omg she's 150 pounds😱
Brit ish : no you bollocks, i'm just 68 kilograms
Actually, the British would typically say she's 10 stone, 10. (a stone is 14 pounds, and the unlabeled unit to follow is the leftover 10 pounds.) That's one of several contexts where the metric system was unable to displace the imperial system in the UK. (Their highway signage often list distances in furlongs and miles too.)
@@TheBurningWarrior never seen this bro in uk i only saw kilogram
Ai hev a queshtion for you: wich is hevier: a kellogramm of steel or a kellogramme of feders?
Straight from the dead MEME graveyard
A kellogram of steel
I mean the spelling hurts me more than the dead meme
@@cianduffy2280 True.
Cian Duffy you do know it’s meant to
Be like that?
1234 5 ruclips.net/video/uH0hikcwjIA/видео.html
5:46 That’s the most geekiest tattoo I’ll ever see.
I was just about to ask you for this video. Because this is THE most important event of 2018, touching everything we do and also touching everyone in this planet in one way or the other. Thanks! And well done!
I bet that imperial system was made with random number generator
The seemingly random numbers come from the need to redefining the SI units. One tenth of a million of a meridian is nice and pretty. But when they decided to use light speed for more precision (since it's a universal constant), the conversion had to adopt those numbers.
@@jmiquelmb It's not a universal constant. The speed of light isn't a constant at all. They showed that in 2015 already.
@ It is in vacuum.
The mile was defined as 8 furlongs. A furlong was the length of a furrow a team of oxen could plow in a day.
A gallon is of Roman origin and it meant "a pailful", as in, 'grab a pail full of water'
A foot was the size of the Kings foot
a pound came from the word "libra" (lb) and was equal to 7000 grains
WuT's HeViAh? A KeLoGrUm Of StEeL, Or A KeLoGrUm Of FeThOs?
But a kilogramme of steel is hævier than fæthers
No but a kilogramme is a kilogramme
Nicholas Zakem no, a kilogram of steel is heavier because steel is heavier than feathers....🤦♂️
@@samrofik1764 what?
IceCube Gaming i see you have not been taught in the way of the kellogram
@@frederikvandrup6081 teach me your ways senpai
Veritasium did it First hehe
Still a nice Video
The more spreading this kind of news, the better! Besides coming with the creative idea and more structured video takes time.
This is about science education, not about who did it first.
I’m surprised they also didn’t mention one of the world’s roundest objects being used to check the Kibble balance work.
I prefer this one actually.
Whats heavier a kilogram of steel or a kilogram of feathers?
It's time for the US to adopt the Metric System.
They already have done so. Mile and pound are simple conversions of meter and kilogram
@@Opharg but why?? They could have used the same kg and meter right??
sriHARI HS no one knows why, the people that made it like this are long gone, and changing it is incredibly expensive.
If Huawei makes a metric chip set , do you think America would accept it. 🤣
In America we are taught both but we only use imperial out of school
- How do you say flamingo in german?
- Schlammingo.
How will this effect the drug trade?
@Charlie K he's high on drugs, that's why he mispelled it.
@@pattrickmerete, yeah he's high on sugar
This affect has had the wrong effect ..yes. 😒 yes...I see
well, 1 kg cocain is still 1 kg cocain, if not, you still lose your head.
Extension Flexxin more precise bag of coke
Fun Fact: The US actually uses the kilogram and converts it to define the pound.
Same with inches. Exactly 2.54 cm in an inch
Fun fact number two. The us officially switched to the metric system.
en.m.wikipedia.org/wiki/Metric_Conversion_Act
@@lumschente Not technically. That act just allowed the metric system to be used, it didn't actually force anyone to convert. Unless at a bare minimum it becomes mandatory that anything government issued or legally binding be in metric only, it can't really be called a conversion
Congrats to all US customary units fans because now the pound (defined as a part of a kilo) is more precise than ever!
"We don't agree on a unit of measurement yet" aka "the US doesn't want to drop the archaic english system yet like the rest of the world did when we decided to go metric "
Well actually the US isn’t the only county that doesn’t use the metric system
@@thatoneguy6139 now it is most also liberia integrated it now so youre the last one i would say
@@thatoneguy6139 YOU ARE THE LAST ONE YOU PATHETIC ... SO much ego can not change the units to something that is scientifically defined
How can you claim that everybody in the world can now access the exact kilo, if you need a super expensive, extremely intricate machine to measure Planck's constant?
They probably wrote down the data results somewhere on some document and published it world wide. Internet included.
So there's no need to make that super expensive, extremely intricate machine yourself.
It's common sense really. I mean, if everyone had to make that machine themselves. They wouldn't have voted for the change.
How did you come to that conclusion?
Planck’s constant was also defined to an exact value. Same with the mole, the speed of light, the meter, and the Ampere.
thanks for not mentioning how it is actually precisely defined (not just "in terms of planck's constant")
you had one job...
2:12
US guy:"we have not agreed on an exact unit of measurement yet"
Scientific Official Units and literally 99% of the world: am I a joke to you?
Where can I get that card
Take a screenshot
But the official one
@@shrivatsakulkarni9282 make it yourself, using indesign
I thought that kilogram is the unit to measure masses not weights.
Its the same thing for all practical purposes
Mass is the physical amount of "stuff" an object contains, expressed in mol. Not entirely the same thing.
@@DarkAngelEU you're wrong.
@@DarkAngelEU moles are a counting unit used to count entities,. not exactly mass.
You thought wrong.
Meanwhile in US:
"Imperial ftw lolbbq XD"
You do realize we learn both and imperial units are based on the metric system, right?
So, what is the defination of Kilogram now?
Planck's constant
Where did that *Roundest object: a silicon ball* go??
Where can we buy that card with all the Units ? #NerdAlert
2:14 How do you get that?
An Otaku James received this card at the ceremony!
Verge Science is there anywhere we can buy it from?
@@winstonwei9694 used Google, did not find. Better solution?
@@winstonwei9694 bragging rights for doofus
The kilogram is dead, long live the kilogram.
Humanities shine the brightest among scientists like these. It's amazing.
Where can I get the card with SI units??
I'd also like to know
You could just take a screenshot
@Harold Potsdamer thanks, I found that one as well, but not the latest version shown in the video.
Given this video and these cards, I bet most people still don't understand how 1 kg is actually defined.
1 kg = ?
I NEED them
3:27 🍀🍀😎🚬 yeah babey
420 BLAZE IT
No it's not... It's just denser...
America got the 420 Weights lmfao! 3:20
America and counting! lol
The verge science is the best science channel!
Why does it have to be pounds? Kilogram is easy and simple, why does people need to complicate things?
This just in: recipes can't exist without a kilogram
Modern society would crumble without it!
Sooo .... now if you want to explain 5 year olds in first grade what a kilogram is , you first have to teach them about the plank’s constant ??
No more than you teach them speed of light in preparation of learning the metre or function of atomic clocks to understand seconds.
wait, since when did we teach the definition of International System of Units to first grader?
they teach it in the first year of middle school ya bafoon
correct... or give them a 1kg bag of flour and tell them that's how heavy it is
Finally, now I can explain to my extraterrestrial friends how the heck we measure stuff.
When you were trying to read whats written on the card but its too shaky..
What's heavier?
a
ｋ ｉ ｌ ｏ ｇ ｒ ａ ｍ ｍ ｅ
of steel
or a
ｋ ｉ ｌ ｏ ｇ ｒ ａ ｍ ｍ ｅ
of feathers?
Got question for ya.
Which one is heavier.
A kilogram in 2019 or a kilogram in 2017.
2019
but steel is heavier than feathers
Mimiz dani but they both a kilogram.
@The Niggalodeon
Its the same.. well technically 2019 is 50 micro grams heavier..
@@raphaellecoeur5738 what? steel is heavier than feathers... I don't get it
This question came in my SSC exam thanks 😃
Why am I just learning this now? I thought it was a new video but it is a year old. Not happy.
The video is a little late this happened november 16th
0:45 Shouldn't it be the tenth part of the meter?
Yes, 1 m^3 equals 1000 L
There is a logical word for 1/10 of a meter, you learn it by going to a good school.
Wow using kibble balance finally recognizing real science on this channel. proud of y'all
That is actually so damn cool, to have the weights and measures tied to natural phenomena rather than physical objects. That's actually mind blowing!
Bugler55 Actually no, only the second is derived from the Caesium Atom. In this case the "hyperfine transition frequency caesium atom" So it's a natural phenomena related to the ceasium atom rather than the atom itself. all the rest are based off of other natural phenomena as can be seen in the new system of units as shown here imgur.com/gallery/FAUdZg5
Now we can no longer hope our scale is wrong... Because one eyelash is sometimes a big achivement (sarcasm sign). 😎
😁
Use /s
LOL
I see you every time I g o to the comments lol
In the science world, it is
I'm really ready to see America adopt the metric system. I feel like it's going to be a gradual process
I don't think it's going to be a process at all.
It's going to take many many years even the next couple of generations are unlikely to see it since it is a building block the country is based especially after the industrial revolution which means it would take a painfully large amount of money to change.
40 years ago when the U.S. attempted a move to metric, it was fought by parents unwilling to learn conversions. Today, they carry cellphones that can do the maths conveniently enough. It would be fought by nationalisit's fear of globalism now. Perhaps next administration.
@@evilotto9200 it's never gonna happen even if we wanted to it's too expensive if it was gonna happen it had to happen during the industrial revolution.
Never gonna happen
bro, its easy.
Just take a uniform object of non-negligible falling at terminal velocity, and set the drag force equal to the weight. Then, in the force of gravity formula, cancel out mass of object one from both sides, giving you acceleration of gravity equals the gravitational constant times the mass of the Earth all over the total altitude squared, and plug in the gravitational acceleration to the drag force. Next, take rho to equal mass of the object over volume in the drag force equation, and plug in the numerical value of the non-changing drag coefficient of the object's shape. Then, isolate the mass of the object from the rest of the equation. It's simple!
Equations:
ΣF_y = F_D - W = 0
F_D = W
1/2 ϱ C A v^2 = mg (1)
F_g = mg = (GMm)/r^2
g = (GM)/r^2 (2)
Plug (2) into (1):
1/2 ϱ C A v^2 = m ((GM)/r^2)
(ϱ C A v^2) / (2 ((GM)/r^2) ) = m
Mass = Rho * Drag Coefficient * Surface Area * Terminal Velocity squared all over 2 Gravitational Constant * Mass of Earth divided by total Altitude squared
told you,, it's easy
I have seen the “ French Revolution” standard kilogram in a museum. It was presented alongside the standard metre which had the year “1799” inscribed on it.
5:29 i see BOB i react LOB ;)
Goodbye Le Grande K, you will not be missed.
well it will still stay around since it has been measured and documented for so long Scientists are gonna continue measure it and it's siblings for years to come for research. Long live Le Grande K.
Everyone else in the world: the metric system is best
Drunk Uncle USA: hold my beer
Interesting to see a physicist having a tattoo of Planck’s constant.
God FINALLY
So basically the plank cte is the new kilogram?
@Astir01 that's quite close , so they're just made the kilograms more if you say acceptable among all the different measuring systems.
But what basis we measure those torque and power?
@@CharDhue you have to go back to electron charge. Electron charge defines current which define voltage. Voltage and current define power and power defines torque. Meter and second is also involve. To define voltage you need a current and distance. To define current you need charge and time. Time is defined by atomic vibration and distance is define by speed of light constant.
Astir01's answer is very wrong! For starters, [J*s] is not the unit of torque, [N*m] is. Also, how long is that beam supposed to be? But even with a unit like [N * m] in there, you can't just assume that it's necessarily about torque, especially when talking about fundamental constants.
Instead, take a look at the _definitions_ (not measurements) of various physical constants described on this card (the link is from one of the other comments):
pbs.twimg.com/media/DsOFIXxXoAEXZJN.jpg
For the definition of [kg], we need to consider Planck's constant
h = 6.62607015 * 10^-34 [J * s],
the speed of light
c = 299792458 [m / s]
and the transition frequency of a Caesium atom
nuCs = 9192631779 [Hz]
Now we substitue the abbreviated units by proper ones
[J * s] = [kg * m^2 / s]
and
[Hz] = [1 / s].
Now we can construct a quantity that has only units of mass by cancelling all other units in Planck's constant:
nuCs * h / c^2 = 9192631779 * 6.62607015 * 10^-34 / 299792458^2 [kg]
which is equivalent to
1 [kg] = nuCs * h / c^2 * 299792458^2 / (9192631779 * 6.62607015 * 10^-34).
So any alien civilization just needs to make machines to determine these constants in whatever alien units they like, and they can convert it to our units with these definitions.
The same can be done for the other SI units as well.
Okay but that one scientist called S. Candel has the coolest name ever
5:29
RUclips: You're demonetized + age restricted.
Is this channel called Ver....itasium?
No.Not really.At lest we have a constant that we can be sure that won't change over time.
Also, Merry christmas!
both system should stay in my opinion.
Merry Christmas
For everyone wondering where to obtain the card. Google? Write the info down? Make your own? The possibilities are virtually endless
Crazy to see how much works goes into making sure 1kg is actually 1kg and not 1.001kg or something. But it probably makes perfect sense. Like they said with the eyelash example
5:43
How much of a nerd do you have to be to do this
@@12xenn45 lol
@@12xenn45 man you burnt him
The man ACTUALLY tattooed it on his arm!
@@nousername191 The absolute madlad!
Every science channel on RUclips
Understandable enough. Those scientists had nothing to do in that beauru, they must be like " Lets change the kilogram!"
Progress mate, progress.
I agree, this is good progress!
but they're both a kilogram...
Niggachu no. They deviate from the exact definition of a kiliogram which is 1.000000... kg, whereas a physical constant will be like 0.999999...0 kg, due to decay. Everything eventually decays radioactively, as well as react with the environment and hence changes the mass
that si units card was nice
Plenty of people in the UK still use the old imperial measurements in part. You buy pints in pubs and even young people understand miles better than kilometres.
Let me see. (takes the kilogram) Alas, poor Kilogram! I knew him, Horatio, a mass of finite jest, of most excellent fancy. He hath weighed me on his balance a thousand times, and now, how abhorred in my imagination it is!
yayyy olde weights fun my fave😋😋
This is from Hamlet, but not sure which fragment. Is it from when he grabs a human skull?
Fantatisc video!!!
Metric is so much easier to use since it's based on 10. We in the USA think it's sooo hard to have to use it because we are not raised on it and the FPS (Foot-Pound-Second) system is so very ingrained in us. If we had been raised in the metric system and someone tried to get us to convert to the FPS system, we would think they were crazy. And we would be right. It's an ad-hoc system based on arbitrary standards.
The one thing that would have been nice though is if the founder(s) of the metric system standards had made the meter to the same standard as the yard. They could have. All they would have had to do is adjust the millimeter slightly to make it all work out. That, at least, would have made the conversion of distance much easier to do in your head. But they didn't consult me, so here we are.
are those hexagon weights with vegetable vendors updated yet?
Most of us will use the old one anyways
Yes, I always take a trip to Paris and ask the SI association for permission to grab the original kg when I want to make a cake
Now if only we could trash the imperial system and make Americans use metric...
Herein the problem..."make Americans use". This might work in countries where the governments are always thought to be benign and correct.
The visit to the prototype standard kilogramme was like Mecca for metrologist. I would often hear the tales of wild parties they had there lol.
2:54 splash. -Maysin Pure
What is the UK guy on saying we use metric for everything? We weigh ourselves in stones and pounds we use Miles for distances and buy milk in pints. We also use the metric system for various things but that’s been a slow change across my life and I’m about the same age as that guy
I personally haven't had a need to learn metric yet. For the few times I'm presented with something only listed in metric, I just ask my phone to convert the metric unit to something useful. Usually that's only when I'm traveling outside the US, but even then I often see friendly pounds, feet or gallons in small print next to metric.
Not true. In the UK we still use pounds and ounces for weighing newborn babies....and weed.
The most important thing in life.....
Where do I get my own fancy card that has all the units on it?
Plot twist: it's actually a kilogram of feathers in the vault