Thank you to the many people who work to ensure the accuracy of the meter. Like, the utility company who sends someone out to check the meter at my house. I am grateful.
You have to pay for parking at your house? did the check the meter with some type of meter? what if you get home without quarters? If somebody has a solution for that, I'd like to meter.
The smallest unit of time that can in ancient times be universally defined no matter where you are on earth is a day/night. In ancient Babylon they did not use a decimal system, which is the numbers system we use today based on a base of 10, but they used a base of 60 or sometimes 12. So the Babylonians decided to divide the length of of time of a day by 12 hours, an hour by 60 minutes and a minute by 60 seconds. And since they were the first ones to do this (well), their use spread across the world until it became the norm. So it's pretty arbitrary but based on the length of time of 1 day. It's like if we divided the length of time of 1 day by 10,000 and called that a second
SI definition of second is "the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom"
Can you continue this as a mini-series on "Why SI units are what they are?" I would take it that the kilogram would be last, not only because it's the only one with a prefix, but also because it's the only one still defined by a physical object.
I used to struggle to accept the metric system because having learned the imperial system during my formative years, it just wasn't second nature to me. But now that I can think of a metre simply as 1,659763.73 times the output wavelength of light when emitted through Krypton-86 in a vacuum, why it's much more intuitive.
Michael Block Or ... 2 meters is a tall man. Or finger tip to finger tip outstretched arms of a tall man. 100 Kg a basketball player. Or short fat man.
pene asteca 1 significant digit. Round up. In the field to estimate range to target, use the height of a man as .... Measuring rope in fathoms ... a fathom ‘bout 2 m.
You don't know what a Uncle Phil Launch is? You never saw Fresh Prince of Bel Air? If not, it's the act of grabbing a person by the waist line of it's pants or skirt and by the back of their neck and throwing them out of a open door into the front yard.
9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom. ~ the Second
Cody'sLab it's crazy to think that almost everything humans have created (units of length and time, vocabulary, etc.) is completely arbitrary. Its only when a majority agrees upon using the same definition for something that we can communicate properly and understand each other. Which means if you get a big enough group of people to agree with naming/pronouncing stuff the same with whatever string of shapes as "letters", you could create a whole new language.
A meter is still around the length of 1 millionth the distance between North and South pole through France at 0°Celsius. Based on that they can't change it, because it wouldn't be a meter anyomore.
William Tannery It's so integrated with America that changing everything like road signs and engineering standards would be far too expensive, there was a drive years ago, but that proved to be too costly and confusing for everyone. It's similar to the situation with the 'qwerty' keyboard layout in that it may not be the most efficient layout possible, but it's been used so long that changing it would require a lot of relearning
Sam Mossbeck I think the best way for that is to ease it in, not suddenly changing all of it at once. For example for at school, students are made to learn both the imperial and metric systems, so that later they can still use both. The length measurement tool also need to have both the imperial and metric system, that way hopefully after some time, people can use metric system fully. I think it's doable, considering NASA also used metric system.
As they still do it today for smaller things. Teodolites, measuring angles and triangulating. And a lot of calculations that must have been a pain back in the day.
A second is 9 192 631 770 changes between two hyperfine levels of a caesium-133 atom is it not? I used to know both the definition of a second and a meter, watching this video brings both of them back, so thank you
when you're trying to describe the wavelength you like and instead of orange they interpret it as hard X-rays, no, I think this will be very high on the list of our worries
Not really. If aliens are cooperative with each other enough to make it all the way to us, and capable of solving problems we're only now just scratching at, why the hell would we not want to communicate fundamentals accurately with them first and foremost? Sure a meter probably wouldn't be up _first,_ but it would be far from the least of what we should learn to communicate.
In Sweden we spell it "meter", "centimeter", "millimeter". Also I hate it when people spell/say "Aluminum" rather than "Aluminium". There are so many things in the english spelling, in general that needs to be looked up and redefined. (I use "Colour", "Neighbour", but still use "meter" and "liter" instead of "Metre" and "Litre" :v) #MisunderstandingEnglishIsKindaOK
100 Hold on just one sec -- aluminium, centre, metre, colour, neighbour, liquorice -- the rest I'm afraid my english is too Americanized to correct. Cheers!
I kinda want an entirely new measuring system which is defined entirely on absolutes (such as Kelvin for example). I also don't like when the definitions have a decimal in them or aren't some multiple of 10 in the thing we're using to define them (so in the case of the meter, the fact it's the distance light in a vacuum travels in 1/299792458 of a second bothers me, I'd much rather something like the distance light travels in 1/100,000,000 of a second; of course, a second also needs to be redefined as time in general is a complete mess (I despise that 1 minute is 60 seconds, I want metric time)). But that'll never happen as it's really just nitpicking and we certainly cannot redefine current standards as something smaller or larger than they currently are. And redoing all measuring systems, and then implementing them, would be far too costly. Another example is, I'd like years to be measured from the start of the universe. Basically, something absolute. I'd also not define a year based on the Earth's rotation at all, as this is only useful while on Earth and is also something which fluctuates.
However, metric time is something that I REALLY BADLY want to happen. It's such a pain in the ass trying to figure things out when 60 seconds = 1 minute, 60 minutes = 1 hour, and then suddenly out of the blue 24 hours = 1 day instead of 60 hours being a day. I know why that is, but it makes calculations involving time such a pain in the ass.
The Crazed Gamer Nope, Newtons measure weight, kilograms measure mass. A Newton is just a kilogram multiplied by a meter and divided by a square second though.
The proper SI unit for mass is kilograms (kg) or 1000 grams. Weight is the gravitational force of an object (Force = mass x acceleration), so while on other planets your weight will change substantially your mass will always be the same. The scales we use on earth are already taking into account our Earth's acceleration (g≃9.81...m/s²) so our actual weight would be our mass [kg] x 9,81 [m/s²] and the unit for that is N (Newton).
Weight is a force (caused by gravity) so it's measured in Newtons. Mass is the quantity of matter that makes an object (Kg). Object mass multiplied by gravitational constant (on earth it's 9.81 metres per second per second) = weight. Someone with mass 100Kg exerts 981 Newtons of force on the ground for example
Ruairidh Grass, actually, he's right on the money: 1 L = 1 dm³, 1 dm³ = 10 cm * 10 cm * 10 cm = 1 000 cm³, 1 L of water, measured at 4°C, has a mass exactly equal to 1 kg. 1 tonne = 1000 kg, Therefore, 1 tonne of water at 4°C has a volume of 1 000 * 1 000 cm³ = 1 000 000 cm³ √
The question about why a second is a second reminds me of a scene in Voltron Legendary Defender where they are trying to figure out the difference between "ticks" and seconds with basically stopwatches
I do not get it!! Why isnt it something very simple and fundamental like "1 billion-trillion hydrogen atoms in a row"??? You than also would have no problem with the definition of a second
It was very simple. 1 meter was the distance between the equator and the north pole divided by ten million. (00:50) But as science progressed, the need for more accurate definitions of 1 meter was required. So instead of inventing a completely new unit of measurement, they just redefined the old one to be more precise.
OvertlyCynical I know but come on lol the US uses imperial, why does it have its own spelling for the metric system developed in France? Why not use the original spelling if it's for a system the country doesn't even use? Why change it?
I had a summer fellowship at NIST several years ago. They have the standard meter artifact in a museum there, along with a retired standard kilogram. The kilogram is the only standard not defined by natural constants; it's still just an arbitrary hunk of metal.
Just today I was just looking up the kilogram, and the International Prototype of the Kilogram, which is the only fundamental SI measurement still defined by a physical object and not a natural constant.
I'm so glad this video was made. My mum is a spectrophotometrist. Which means she is a measurement scientist for light, (measured in candela). This is an area of science which most people don't know we need. She a part of the measurement lab for New Zealand. This is where they "keep" the ISU. They also have the national clock.
A meter is something you use to measure things (e.g. thermometer, barometer), while a metre is a unit of measurement. Different things, different words.
I love how something that seems as banal and boring as a meter actually have such an awesome history and complexe reasoning. Thanks for the cool video :)
Thank you to the many people who work to ensure the accuracy of the meter. Like, the utility company who sends someone out to check the meter at my house. I am grateful.
You have to pay for parking at your house? did the check the meter with some type of meter? what if you get home without quarters? If somebody has a solution for that, I'd like to meter.
schadenfreudebuddha I dated a Meter Maid for a while. Nice lady, but it was awkward, I was almost twice her height.
If you work it right, that can actually be a good thing. WINK! just don't kilometer maid, or you'll be COURTING a judge.
why do you shitheads upvote his boring comments?
Jacy...are you suggesting we should upvote your pointless hostility? not a very MEASURED opinion, I'd say!
I've been told there's a woman who has good reasons to use imperial units over metric units... but I have yet to meter.
Carlos .........carrrloooos......
Carlos bam puns
Carlos Yeah I heard about her. My Gramps told me, and I was Centimeter but I got stood up.
Mister Carlos, it's better you get out of the internet on your own, or I "Uncle Phil Launch" you out for that pun.
Kilanna Thank you. It would have been a shame if this comment went without the followup Magic School Bus reference.
Why is a second a second?
the 60s come from an ancient base-60 counting system
because i am first!?
a second is a cesium-186 atom rotating a sertain amount of times i think
The smallest unit of time that can in ancient times be universally defined no matter where you are on earth is a day/night. In ancient Babylon they did not use a decimal system, which is the numbers system we use today based on a base of 10, but they used a base of 60 or sometimes 12. So the Babylonians decided to divide the length of of time of a day by 12 hours, an hour by 60 minutes and a minute by 60 seconds. And since they were the first ones to do this (well), their use spread across the world until it became the norm.
So it's pretty arbitrary but based on the length of time of 1 day. It's like if we divided the length of time of 1 day by 10,000 and called that a second
SI definition of second is "the duration of 9 192 631 770 periods of the
radiation corresponding to the transition between the two hyperfine
levels of the ground state of the cesium 133 atom"
Can you continue this as a mini-series on "Why SI units are what they are?" I would take it that the kilogram would be last, not only because it's the only one with a prefix, but also because it's the only one still defined by a physical object.
English Yard? What about Scotland Yard?
Kiwi Colonel Lols M15
Kiwi Colonel ha!
They are always stickin it to us Scots.
Welsh yard. Everyone forgets Wales.
Flying fox of the yard!?
for another time.... i see what you did there
+
What?
Time... time... oh, it's a pun... with great timing.
Petar Tsankov oh. i only thought of the shoddycast
Wojtek Kiraga 🙌👏👏👏👏👏😂😂😂😂😕🙋😂😂😂😂👌👍
+
Do a Tesla mini-series covering all his inventions and discoveries.
this post will be posted on all future videos until we get the mini-series.
redracerb18 do a Elon musk mini series
that would be a lot easier then a Tesla series. maybe 10 episodes max for musk.
Have fun wasting your time? Good luck? IDK what to say, does anyone else care?
Grant D No, tesla is a hipsters scientist.
The World Is Logic Tesla was a scientist who did real work , Thomas Edison stole most of his work
I used to struggle to accept the metric system because having learned the imperial system during my formative years, it just wasn't second nature to me.
But now that I can think of a metre simply as 1,659763.73 times the output wavelength of light when emitted through Krypton-86 in a vacuum, why it's much more intuitive.
Michael Block lol
Michael Block
Or ... 2 meters is a tall man. Or finger tip to finger tip outstretched arms of a tall man.
100 Kg a basketball player. Or short fat man.
Larry Scott 2 meters is a tall man? 2 meters is a giant
pene asteca
1 significant digit. Round up.
In the field to estimate range to target, use the height of a man as ....
Measuring rope in fathoms ... a fathom ‘bout 2 m.
A metre is roughly the size between the floor and my hip. That's intuitive enough for me.
"Meter? But I hardly know her!"
Conor M. Well, how will ya get to know her if you never meter?
Mister Conor, better you get out on your own, or I "Uncle Phil Launch" you out for that pun.
good one
You don't know what a Uncle Phil Launch is? You never saw Fresh Prince of Bel Air?
If not, it's the act of grabbing a person by the waist line of it's pants or skirt and by the back of their neck and throwing them out of a open door into the front yard.
"Of course then, you have to find what a second is, which is a story for another time" Damn I love Scishow, and their dry humor
9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom. ~ the Second
still relative
still relative
NOOOOO!!!! make it 1/300,000,000th of a second! ga! I am going to have to make up my own system aren't I.
hi
Cody'sLab it's crazy to think that almost everything humans have created (units of length and time, vocabulary, etc.) is completely arbitrary. Its only when a majority agrees upon using the same definition for something that we can communicate properly and understand each other. Which means if you get a big enough group of people to agree with naming/pronouncing stuff the same with whatever string of shapes as "letters", you could create a whole new language.
That's right! I've always wondered why they did not round it up to 1/300,000,000th of a second :\
A meter is still around the length of 1 millionth the distance between North and South pole through France at 0°Celsius. Based on that they can't change it, because it wouldn't be a meter anyomore.
Vorname Nachname
Correction, 1/10,000,000 of 0-90 latitude, not pole to pole.
Royale with cheese.
but what do they call the whopper?
schadenfreudebuddha I dunno, I didn't go into a Burger King
Why do they call it a royale with cheese?
They got the metric system there, they wouldn't know what the fuck a Quarter Pounder is.
French here: we call it "Whopper".
Hey Hank, why does America still use the imperial system?
I guess nobody's stopping them from using it.
William Tannery because we are assholes lol
William Tannery It's so integrated with America that changing everything like road signs and engineering standards would be far too expensive, there was a drive years ago, but that proved to be too costly and confusing for everyone. It's similar to the situation with the 'qwerty' keyboard layout in that it may not be the most efficient layout possible, but it's been used so long that changing it would require a lot of relearning
Sam Mossbeck I think the best way for that is to ease it in, not suddenly changing all of it at once. For example for at school, students are made to learn both the imperial and metric systems, so that later they can still use both. The length measurement tool also need to have both the imperial and metric system, that way hopefully after some time, people can use metric system fully.
I think it's doable, considering NASA also used metric system.
William Tannery because we're America and everything we do is right and everything everyone else does is weird.
Hearing the history of the meter and how it's definition has changed was so interesting. I love these types of videos!
Please make these into a mini series covering all the SI units =)
HOLD ON NOW! What did they use to measure the distance between Dunkirk and Spain with?
Hmmm, well thought indeed...
jason200912
Old geographic measuring is fascinating. Look it up on the internet, you won't be disappointed.
probably oprical tools.
They got down on their elbows and knees and measured in cubits from Dunkirk and Spain. Painful for them, really.
As they still do it today for smaller things. Teodolites, measuring angles and triangulating. And a lot of calculations that must have been a pain back in the day.
I want the story of the second ASAP. This is extremely fascinating.
en.wikipedia.org/wiki/Second#Based_on_cesium_microwave_atomic_clock
Thanks for the new video! I really love your channel :)
One of the best videos I've seen yet. Keep up the good work
That's why scientists increased the speed of light in 2208.
James Moriarty also impossible.
A second is 9 192 631 770 changes between two hyperfine levels of a caesium-133 atom is it not? I used to know both the definition of a second and a meter, watching this video brings both of them back, so thank you
could you do more videos explains the history of SI units? this was great
Love it. Thanks Hank.
I am pretty sure that figuring out how to tell an alien what a meter is will be the least of our worries once we meet them LOL
when you're trying to describe the wavelength you like and instead of orange they interpret it as hard X-rays, no, I think this will be very high on the list of our worries
If Star Trek has taught me anything it's that our first question should be: wanna make out?
Not really. If aliens are cooperative with each other enough to make it all the way to us, and capable of solving problems we're only now just scratching at, why the hell would we not want to communicate fundamentals accurately with them first and foremost? Sure a meter probably wouldn't be up _first,_ but it would be far from the least of what we should learn to communicate.
next topic: why is a second a second?
I'm really amazed(?) by this community, you all are so awesome !
Love this channel.
6.18724203x10^34 planck lengths would be a more objective definition
what is a plank lenght ?
planck length is completely hypothetical, can't be measured and probably never will, so not really a good measuring stick.
Creuilcreuil _ The smallest possible length.
which is defined using which system ?
***** metric
In Canada we spell it 'metre'. I can't even look at the title for too long.
Aluminum, Center, Meter, Color, Neighbor, Licorice, Sulfur, Phosphorus, Cesium
Really? I've only ever seen it as "Meter" in Southern Ontario...
Sounds like a sad life
In Sweden we spell it "meter", "centimeter", "millimeter". Also I hate it when people spell/say "Aluminum" rather than "Aluminium". There are so many things in the english spelling, in general that needs to be looked up and redefined. (I use "Colour", "Neighbour", but still use "meter" and "liter" instead of "Metre" and "Litre" :v) #MisunderstandingEnglishIsKindaOK
100 Hold on just one sec -- aluminium, centre, metre, colour, neighbour, liquorice -- the rest I'm afraid my english is too Americanized to correct. Cheers!
Man I love this channel
Amazing quality video Hank!!
I kinda want an entirely new measuring system which is defined entirely on absolutes (such as Kelvin for example). I also don't like when the definitions have a decimal in them or aren't some multiple of 10 in the thing we're using to define them (so in the case of the meter, the fact it's the distance light in a vacuum travels in 1/299792458 of a second bothers me, I'd much rather something like the distance light travels in 1/100,000,000 of a second; of course, a second also needs to be redefined as time in general is a complete mess (I despise that 1 minute is 60 seconds, I want metric time)).
But that'll never happen as it's really just nitpicking and we certainly cannot redefine current standards as something smaller or larger than they currently are. And redoing all measuring systems, and then implementing them, would be far too costly.
Another example is, I'd like years to be measured from the start of the universe. Basically, something absolute. I'd also not define a year based on the Earth's rotation at all, as this is only useful while on Earth and is also something which fluctuates.
However, metric time is something that I REALLY BADLY want to happen. It's such a pain in the ass trying to figure things out when 60 seconds = 1 minute, 60 minutes = 1 hour, and then suddenly out of the blue 24 hours = 1 day instead of 60 hours being a day. I know why that is, but it makes calculations involving time such a pain in the ass.
A meter measures. A metre is a unit of measurement. ;P
Simon Southey-Davis Here in France, we use a mètre to measure mètres so it's no big deal...
That's cheating ;)
Pretty sure i'm not the only one that wants a video on what defines a second, and other SI units!!! Pleassseeeee!!!!
Awesome! Thank you!
metre* 😅
and litre 😆
Either is correct so there is no need to bother him
Nicholas' Trombone no, metre is the unit, meter is the device
James Ch *FACEPALM*
Trump be like: Oh. meter is fake news, doesn't exist. I measure distance in miles!
Oh god, now I desperately need the episode about the standard second.
Please, make it happen!
it has already happened long ago.
Thank you for everything
why are grams used as "mass", don't they measure weight?
also is there any actual unit of mass?
The Crazed Gamer Nope, Newtons measure weight, kilograms measure mass. A Newton is just a kilogram multiplied by a meter and divided by a square second though.
The proper SI unit for mass is kilograms (kg) or 1000 grams. Weight is the gravitational force of an object (Force = mass x acceleration), so while on other planets your weight will change substantially your mass will always be the same. The scales we use on earth are already taking into account our Earth's acceleration (g≃9.81...m/s²) so our actual weight would be our mass [kg] x 9,81 [m/s²] and the unit for that is N (Newton).
Weight is a force (caused by gravity) so it's measured in Newtons. Mass is the quantity of matter that makes an object (Kg). Object mass multiplied by gravitational constant (on earth it's 9.81 metres per second per second) = weight.
Someone with mass 100Kg exerts 981 Newtons of force on the ground for example
kilogram is mass
kilogram-force is weight
two different things that people use interchangeably.
Or 1 Cm cubed = 1 gram of water at it's maximum density (4°C)
That is 1m cubed = 100 grams of water at it's maximum density (4°C)
water isn't unidimensional.
1 gram of water is 1 cm³
1 kg of water is 1000 cm³
1 ton of water is 1 m³ (1,000,000 cm³)
GraveUypo whoops I forgot to add the cubed my bad. will edit. btw 2 of your measurements are wrong
Ruairidh Grass, actually, he's right on the money:
1 L = 1 dm³,
1 dm³ = 10 cm * 10 cm * 10 cm = 1 000 cm³,
1 L of water, measured at 4°C, has a mass exactly equal to 1 kg.
1 tonne = 1000 kg,
Therefore, 1 tonne of water at 4°C has a volume of 1 000 * 1 000 cm³ = 1 000 000 cm³ √
Ruairidh Grass
Oh the perils of not proof reading.
“cubic meter = 100 g”. Glaring mistake. I’ll call it a typo. But as typos go, that’s huge.
Good video, thanks!
i wondered about this for so long back in school
Incorrect spelling: "metre" refers to the SI unit where as "meter" is a measuring device for exampe 100 metres vs a water-meter
To all the snarky people doing the metre* correction, he's American, it's the way we spell it. American English =/= British English.
Thank you
Lol stfu
How about you stfu. He is just showing why it's spelled like that, no need to get mad about it.
Hi SciShow,
I love your videos!
Can you make a video on Quantum Tunnelling?
The question about why a second is a second reminds me of a scene in Voltron Legendary Defender where they are trying to figure out the difference between "ticks" and seconds with basically stopwatches
For the record, its spelled metre.
why can you drink a drink but cant food a food
This was on my mind yesterday... What a coincidence!
+scishow how many times would you have to shuffle a deck of cards to get it in perfect order?
first
Krabbel8beiner for real though
I do not get it!! Why isnt it something very simple and fundamental like "1 billion-trillion hydrogen atoms in a row"??? You than also would have no problem with the definition of a second
sounds like too much work. calculating light would be much easier.
that's a lot less fundamental and harder to derive than the speed of light for a defined time. atoms don't line up like that.
but that depends on how accurate you can measure light waves
it will not be 100% at any time
ony theoretical! like the diameter of one atom times 1 billion trillion is 1 meter. thats how I meant "in a row"
It was very simple. 1 meter was the distance between the equator and the north pole divided by ten million. (00:50)
But as science progressed, the need for more accurate definitions of 1 meter was required. So instead of inventing a completely new unit of measurement, they just redefined the old one to be more precise.
I can't wait for the second!!!
please have a video for each fundamental measurement, and put them all in the same playlist.
Spelt metre wrong lol
OvertlyCynical I know but come on lol the US uses imperial, why does it have its own spelling for the metric system developed in France? Why not use the original spelling if it's for a system the country doesn't even use? Why change it?
Because murica. They like to be special so just leave them
Many countries spell it like that, it's not unusual.
We gotta buncha good stuff! Haha! Great ending Hank.
Great video
please make one for the Kilogram too
I was not expecting this one to be interesting!
Sir you explain very good I like your explanation
I had a summer fellowship at NIST several years ago. They have the standard meter artifact in a museum there, along with a retired standard kilogram.
The kilogram is the only standard not defined by natural constants; it's still just an arbitrary hunk of metal.
that ending just made me so happy :)
Way to raise the bar!
Hey! Could you please do a video on what is charge?
Ooo do more SI definitions!
Just today I was just looking up the kilogram, and the International Prototype of the Kilogram, which is the only fundamental SI measurement still defined by a physical object and not a natural constant.
Please do the "what is a second" video. Really intrrested
I'm so glad this video was made. My mum is a spectrophotometrist. Which means she is a measurement scientist for light, (measured in candela). This is an area of science which most people don't know we need. She a part of the measurement lab for New Zealand. This is where they "keep" the ISU. They also have the national clock.
loved it
absolute and perfect pitch please!
learnt this in class yesterday - thats some coincidence
thx for this awesomely ha bisky vid i love learning things and that i can actually understand all of this
Does this mean there'll be a series on each of the 7 fundamental SI units? That'd be pretty interesting.
how did they measure/ do the math of deviding the distance between the equator and the north pole if they diddnt have a unit of measurment to divide?
Great! Could you guys make a video on that pure Silicon sphere to redefine the kilogram Veritasium's Derek made a video about some time ago?
Would love to see a "Why is a second a second" video now =D
I think you'll find it's metre, not meter
It depends on the country you're in, mate
Quinn pretty sure it's metre everywhere but spesh ville Murica
Quite right, but since they're mostly Americans at SciShow, it makes sense for them to spell it familiarly
A meter is something you use to measure things (e.g. thermometer, barometer), while a metre is a unit of measurement. Different things, different words.
In Germany a "Meter" is a Metre.
You should make a video about how they defined a second
"WHY'S A SECOND A SECOND?" next please ♥
No matter where you go, there you are.
When you talk about the creation of the second, can you talk about Time Cube?
How do you measure the distance between Dunkirk and
I love how something that seems as banal and boring as a meter actually have such an awesome history and complexe reasoning.
Thanks for the cool video :)
Hilarious when he states the tinkering isn't over. "Now we've got to define seconds." LOL
when are you going to the video of second ,would you define it as the time it takes for the light to travel one meter in vacuum ??
plz
make videos for the other SI units too bro
This episode makes me think a lot about "The Arrival".
I really hope "a second" is defined as "the time it takes for light to travel 299,792,458 meters."
I just was wondering this on Saturday afternoon. scishow you scare me sometimes.
This episode really needed a JoJo To Be Continued Ending, I'm so excited for the follow up video!
awesome！can you do the kilogram next? Really want to know the story about it.
Can't wait to see the story of how the second came to be the 9 billion and something oscillations of that one electron of Cesium-133
"Then you have to define what a second is..." Bring in the cesium atoms! :D
2:58 Hank interrupts Hank.
WELL WELL WELL I shall expect a video titled "Why's a Second a Second?" from SciShow in the near future.
Can you guys explain the recently discovered/invented time crystals please
Awww, now I need to research a second! Gawd, I love science!!
~Trav
Meter and cm is amazing
As accurate as these fundamental units get defined, everyone should know the primordial invention of such metric units.