Boiling Water - Periodic Table of Videos
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- Опубликовано: 30 май 2024
- Original Everest video: • Water Boiling at Evere...
This video features Martyn Poliakoff, Samantha Tang and Neil Barnes.
Thanks to Buddhi Rai and Chandra Rai for all theri help with the Everest boiling.
More chemistry at www.periodicvideos.com/
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From the School of Chemistry at The University of Nottingham: www.nottingham.ac.uk/chemistry...
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/ favscientist (Favourite scientists)
/ bibledex (Academic look at the Bible)
/ wordsoftheworld (Modern language and culture)
/ philosophyfile (Philosophy stuff)
/ psyfile (Psychology stuff) 
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"I thought 'critical temperature of water - I must buy that car!'"
Oh man I love you, Poliakoff :D
I applied for a program for a university that I really wanted to get into and I had to write a supplementary application for admission. One of the questions was to discuss who is my favourite scientist and why he is my role model. I talked about Professor Poliakoff and how he is so passionate in learning about science everyday and I got into my program! Thank you Professor Poliakoff and Brady for being such inspirations in my life!
Professor: pointing out all the flaws in Brady's experiment was super-critical of you.
This is probably the best explanation of the concept of boiling I've ever seen.
Cool story about the car, btw.
this dude is epic
he got a haircut!
This guy is awesome! I'm addicted to his videos now and will probably watch them all.
amazing footage of Brady at Everest.
i love watching these videos even if i already understand the topic. You guys just make it interesting.
Thank you for making your videos, they teach me so much and i really enjoy them. Keep doing what you do!
i SOOOO wanna go to that school, just because of him. the professor is AWESOME! he actually makes chemistry so much more interesting and fun.
The Professor is such a nice and engaging person I swear I could listen and easily learn whatever he would teach.
Awesome video! Even on topics that I think I completely understand, these videos always make me see it in a new way, and usually learn something
I missed the videos! glad they are back (:
dear prof. poliakoff, you are awesome.. the best videos on youtube.. I love the way you explain things. Thank you great sir.
I always took science class in school even when it wasn't compulsory and i failed yr 12 science miserably (i was horrible at math) but i loved learning and knowing the concepts and the physics behind what happens on earth. Great video and keep it up!!!
Thank you for explaining this! My chemistry teacher never explained it very well.
omg science is a real man
Love periodicvideos! Currently studying HND in Chemistry :)
Wow, I learned something awesome today.
I really enjoy these videos!
I'd LOVE to hear more about your water research as I am an Environmental Engineering student. Thank you.
Great explanation, thanks. I'll use this video for my students for sure :)
Such a nice bloke. Thanks
Fascinating... Great vid!
If you read the video description (still don't understand why people don't do this as a first reaction to having a question, just /before/ commenting), you'll see that it says "From the School of Chemistry at The University of Nottingham" and includes a link to the department.
BZ! I love this channel BTW.
thanks allot your comment really helped me to answer my question. thanks again and best wishes.
Love the vids Brady. Could you do one about partial pressure of O2, related to altitude? I can't get my tiny mind around it!
Hi, I have got an idea about a new chemistry series for you: can you do a weekly episode where you chronologically mention the highlights of each decade (starting at some arbitrary point, and highlighting one decade per episode). Thus, It will be a series about the history of chemistry, and how things got to where they are today. Thank you!
"Brady bashing" by "el proffo" GREAT STUFF!
The properties of water never cease to amaze me.
Super critical is also called "super heated".
I think I learned something new. At about 3:16 in, is the professor saying that a big component of the heat of vaporization is due to work being done against the atmosphere? I had assumed that it was an entropy thing like the heat of fusion or am I reading too much into it. Thanks
does the same effect apply to alcohol? like, could you high-pressurise distill alcohol, to achieve a higher percentage? by reducing the amount of natural vaporizing water/02
Talking about thermodynamics in a cool way. That is rare ! Would have been super nice if you talked about the Triple point though
When i click on the linked annotation at the end ("more about the hot water rig") it doesnt show the video, instead there is an "this video is set to private" error msg
You should make a video about water's Critical Point. That sounds very fascinating!
Dear Brady,
Professor Poliakoff said that the pressure on top of the mountain is less than on sea-level and you proofed that with boiling water. my question is, how does the low-pressure envirnoment affect the solid water on top of the mountains, also shown on your Video footage. is there a simmilar abnormality in melting or something compareable like the boiling water?
Thanks
Fascinating. I've been a submarine cook for the last 12 years and I have noticed that water takes longer to boil the deeper we go. We also operate with a slight pressure on the ship. Would that also contribute to water taking longer to boil?
At 1:33 why the reflection of the professor's tie is turned? Why is the reflection reading backwards through water?
holy crap i learned something! 374, must remember
At first I thought your question was crazy, but then I got to thinking and now I'm really curious!
there is an procedure for making hydrogen by passing water vapor above coal embers can you explain in detail that procedure? i am really curious cause water vapor is water vapor not mix of hydrogen and oxygen so i really want to know what happens.
gibbs free energy will tell us the value of the equillibrium point at which the two phases can exist or above or below the temparature that one will be stable,it does not come in handy when we want to measure the conversion points at various pressures and temparatures..that is why Dr.Gibbs himself made the Phase rule(F=C-P+2) and perferctly described phase transitions..at normal single temparature cases though you are correct :D
please post some videos on the sixty symbols also...good work...thankyou!!
I got super excited to see supercritical fluids when he mentioned the concept in the video. A quick search on RUclips of course landed me right back at the professor showing off a supercritical fluid demo rig he has in his office. You really should link to that video. I can't believe you made it back in 2008 and here we are looping back to the subject.
It's here, by the way:
/watch?v=yBRdBrnIlTQ
Water can explode by high temperature or high pressure without get steam stage?
... Martyn was as patient as a saint explaining the most basic experiment ... boiling water ... No suprise the signature tie was black and diffused ... 372 C is acceptable Proffesor ... too hot for tea ... well done all ...
What interests me in this context, is how much the pressure changes the other phase transitions.
And how much difference is there from water to other fluids. I always hear that water is pretty unique in many ways.
why did you take down the video of extra footage? It was up earlier today.
Yes, the plate is a unique number registered to that car. Not the owner.
It is possible to transfer the plate to another car but only if the plate is the same year or older than the car you want to transfer it to.
You deserve more thumbs up
Iv always heard that to make questionable looking water safe to drink you need to boil it to kill of any bacteria or microbes in it and at see level that would be around 100 c. but what about under the vacuum at 14 c. does that render the water "drinkable" or is it less a matter of boiling and more a matter of getting the water hot that kills the crud.
Thanks you for the answer and the lip.
If you get below the triple point of pressure with some liquids (water in particular), you will find ice sublimating directly to water vapor without going through a liquid phase.
Admittedly if the substance is already a liquid it will immediately boil in a vacuum as well, so you are somewhat correct. It is just that such liquids need to form in higher pressure locations in the first place.
Isn't anyone else curious about what the correct boiling point is for each of the altitudes in the first video and what it would be a the top of Everest (~8848). I believe it should be possible to calculate it at standard pressure for a given altitude. One of the things that Prof didn't mention is that air pressure varies at any given altitude depending on depth of the air mass above that spot. It varies as a function of air movements and air temperature.
Thank you! I didn't understood that all the molecules don't have the same energy. But if I understand well, the boiling point is just the temperature when half of the molecules have enough energy to become gazeous? It seems a much more precise way to define the boiling point. (Sorr for my english...i'm french)
@mrcrazymadwhat its the phase diagram of water pressure vs. temperature..
It's very nice of Poliakoff to explain GCSE level physics. And yes, stream water will contain minerals, amongst other things, slightly reducing the freezing point of water.
Hey Prof, I am not sure how car license plates work in the UK. Is there a way to keep the number, say by buying it? Nonetheless I would suggest that u get a new car. Cars that are too old post a danger to the driver.
Depends ... if u could boil a spherical blob of water, i assume the the ISS's internal pressure is slightly differnet than at sea level, so it would be slightly different
Not sure if you received an answer or not, but what happens is that because there is no pressure- or next to no pressure- in space, then the water boils instantaneously. But oddly, because of how cold it is in space, that now gaseous water freezes very rapidly afterwards. You can do something like this at home by boiling water on a cold winter day, then going outside and tossing it into the air. It should finish boiling and turn into snow rather quickly.
This guy looks like science.
So was it a total or partial immersion thermometer?
A question for the professor; This has be hunting me for a while. Why does hot (90*C) water freeze 'faster' than RT temperature water? And if so, does the crystal of the ice difference between them?
More on pressure and boiling, Brady! Maybe power plants or something?
Would very much like to attend his lectures.
But you also have to say that the PTC/NTC Sam is using is also not exact to the point, because every measuring instrument has a bit of failures. I also need a little help on the freezing temperature here, Because i also have seen water not frozen at -4 degrees at our place (but i have to say it was no constant cold of many days just 2 hours) and also you can see the water in the lake is rather sludgy than fluid ( i mean about to freeze) soo... please don't be too harsh :) Nice video as always!
So did you guys get new lighting or is this the first time you shot a video on a sunny day?
What university/establishment does the professor work at?
Is there any way we can get in touch with the professors? Like a Q and A of sorts?
Best tie ever :D
The extra footage of this is set to private!
Would boiling water for tea at high altitude produce cooler water and therefore weaker tea? I mean if the tea water boils at lower temperatures, is it still as good of a solvent at lower pressures?
This dude is awesome!
Chiara's correct for a pure water system. Look up "water phase diagram" and you'll be able to understand better what she has said. As the professor said however, this water is possibly (probably in my opinion) impure.
at around 2:13 he says that in an enclosed space there is an equilibrium between gaseous and liquid water, and that causes a pressure ( called vapor pressure), but later on the he says that when the vapor pressure is equal to the ambient pressure it boils. How can that be if the space is enclosed? Does he mean that the water is encapsulated by the air?
How can water molecules near the surface come out? (1:42)
Isn't this thermodynamically unfavorable when the atmospheric pressure is greater than the vapor pressure?
Or how can ice sublimate in my freezer at normal pressure? (/watch?v=7Oq9_L4odNY)
They spoke of boiling water and pressure, but never mentioned latent heat of vaporization. With the changes in elevation and air pressure I think this would have been a good experiment to display this concept.
you should do some a video on other interesting things about supercritical fluids and their properties etc
It really makes me wonder about all the different variables and states of water you could have when you alter the pressure/ the temperature 🌡️ Then add the situations around other planets or moon's that contain icy worlds but with a liquid ocean layer to them. Same goes for places like titan and places with other liquids. The more I think about it, It's pretty crazy how many variations could be possible with any liquid compared to its pressure and vapor point temp/ freezing temp.
This got me thinking about what the chemical process is that results in salt preventing water from freezing below 0 degrees centigrade. Based on what he said about impurities in water affecting its boiling point, I'm curious if that's the same thing happening with salt. But then, why does salt cause snow and ice to melt? Or does it just accelerate the melting once it's already started?
Oh Niel!!!
I love it!
Great video thanks :)
Wait, I didn't understand the part about the freezing point however. :( So the water just COULDN'T have been -4º C ? Melting point doesn't change with pressure as boiling point does?
Is it more effective to run a steam engine by lowering the pressure to boil, or conventional heating it to boil.
is that low boiling temp hot enough to sterilize the water for drinking if it had something nasty in it
I'm not sure what your question is; but a pot 'with a lid on' is a pressure cooker.
would it not be in equilibrium even if the container is open? dew point psychometrics and all that jazz?
Oh man Brady. You got ground up. Better get back there and do it again :)
1:33. Suddenly, and simply because its Poliakoff, I got excited about a glass of water.
Does anyone know if the license plate format somewhere would allow H2O 374?
I can't wrap my brain around this many things well enuf, so I'm prolly making a mistake here, but..
Isn't the lower temp of the liquid glacier actually correct according to your 'splanation? If water can boil at a lower temp, doesn't it make sense that it can retain a liquid state at a lower temp as well. It's only one state removed. The entire temp range (both top and bottom) for liquid simply moves down as the pressure goes down.
What am I missing?
Apparently the rig extras video is set to private...
if you pulled the kettle of water up a wire into space, would the water boil off, or freeze solid? i'd like to see that.
I always thought it will solidify, or freeze, if you want. It's metal after all, and normal state for metals is solid. I mean, the melting poing of mercury is quite close to water (-38 deg. C), but the boiling point is much, much higher (357 deg. C). And it's very dense, so the gas that forms inside can't go out as easily as water vapor. That's why i'm interested in it - both versions are plausible, but only one can be true.
Generally yes. You might get the problem if you put the metal into a vacuum-chamber to lower the boiling point that it starts subliming instead (going directly from solid to gas, like dry ice does)
I have finally understood what the critical point is! ...and I thought watching a video about boiling water wouldn't be interesting