Boiling, Atmospheric Pressure, and Vapor Pressure

A video about the phenomenon of boiling for the Khan Academy talent search contest, July 2016.
Images:
Image of Earth from Space (1:12):
commons.wikimedia.org/wiki/At...
Layers of Atmosphere (1:21):
www.grc.nasa.gov/www/k-12/air...
Mount Everest (2:05):
commons.wikimedia.org/wiki/Fi...
This video is composed of three main sections:
- An Introduction to Boiling
- Atmospheric Pressure and Boiling
- Vapor Pressure and Boiling
By understanding the physical phenomenon of boiling other concepts, such as the effect of temperature on molecules, atmospheric pressure, vapor pressure, intermolecular forces, and temperature become more understandable.

[@Rohit9o]

The only video on youtube that explains this concept perfectly!!!!

[@wbreslyn]

Thanks! --- Dr. B

[@dipeshmalik6865]

Yeahh!!!

[@OnerousEthic]

Not quite perfect in my mind. See top level reply under separate cover.

[@syedaairfan]

No jargon, no BS intro; cuts straight to the point with clear animation/demonstration and simple explanation. We need more such videos! Many thanks to the creator!

[@wbreslyn]

You are most welcome!

[@dovgewirtz1633]

The world needs more simple videos like this one !

[@wbreslyn]

Thanks! --- Dr. B

[@muzammilsoomro6079]

By far the best explanation I've come across

[@mrnaseem6507]

seriously! many many many thanks. You don't know how happy I am feeling after watching this video. It helped me solve my long pending answer. Had you been here...i would have kissed your hand sir. Thanks once again.

[@Rakeshkumar30]

Simply brilliant...this is the clarity every kids taking science should have

[@ruthgoldblum919]

but WHY do the molecules act the way they do when heated? This video fails to explain that.

[@karthikchowdary6649]

@@ruthgoldblum919 dude finish your 10th standard first,then u can research about pressure.

[@MrRavsta88]

Wow. Such a perfectly explained video without being overly complicated. I loved the use of analogies and real life demonstrations. That was perfect.

[@Honey-hm7mp]

that's what every student needs.easy and simple explanation .

[@yashvisaharan2597]

this man's a legend! tomorrow's my exam and your video singlehandedly cleared my understanding of this topic and i have been struggling for weeks! Thank you so so much!

[@ht-ve9fe]

I think my favourite part about learning concepts is that click moment where you didn't quite understand something and then suddenly it all falls into place.

[@wbreslyn]

I agree 100%. It's sort of magical sometimes.

[@randomist1235]

Amazing presentation! no crappy intro, music or anything, and the part of showing which topics are next. Thank you!

[@youtubeweb3009]

Absolutely the best explanation of this here in youtube .Thank you so much Dr.Breslyn!

[@rashmanidutta1379]

Perfectly explained.I was having a doubt in this topics for a long time but you cleared it.Your explanation is brilliant

[@caseylocke4474]

This is a GREAT video and showed exactly what I wanted to understand! Thank you so much for taking the time to create and share this! Just a minor suggestion, and this only because I'm coming from the point of view of someone who does voice overs. There is a good deal of mouth noise in the video which can be mitigated by setting your microphone to cardioid mode, dropping the gain a little from what it was, making sure your teeth are brushed and having a cup of a hot, clear liquid such as apple cider or hot tea. Just throwing my 2 cents in from my experience. Again, the video was awesome and I have not yet found a better one! MUCH appreciated!

[@wbreslyn]

Thanks for the suggestions - recording quality is an area I would like to improve. I recently got a Yeti Blue mic and just checked to be sure it is on cardiod mode (it is). I believe I was using an older mic when I did the video. If you have a chance, see if this video is any better: kzbin.info/www/bejne/bJOZeJSad5drpZY . ---Dr. B

[@AbcDef-sb8tf]

I don't even have to rewatch many times to understand. This is the best Explanation ever. Thank You!

[@wbreslyn]

You are most welcome!

[@ajshowdown8033]

The most perfect video on youtube to understand boiling phenomenon and vapor pressure!

[@decodingcap9965]

For a period of 6 minutes, I fell in love with physics. Nicely done explanation. Thanks,

[@wbreslyn]

That is great to hear!

[@user-wm9cv4fu6g]

I am truly grateful to you. I never thought it would ever be so clear to me. Thank you very much.

[@TheChaosOfTheShadows]

This video is fantastic! Thanks so much for it! I finally understand these concepts! You’re a lifesaver!

[@Createbyhe11111]

Kudos to the creator for making this concept clear to me...

[@clhe3375]

Amazing video, loved it! Helped me understand vapour pressure in less than 10 mins.

[@sonuchoudhary8600]

Generally I don't comments on any kind of videos but after watching this video I can stop myself to do this ... perfect concept

[@wbreslyn]

Thanks, this is one of the best videos I've done to date!

[@aliquis4460]

1:56 my chem teachers piling chemistry on top of me

[@wbreslyn]

Yah, that's chemistry for you...

[@kaamidy]

before this i just know the definition of boiling but you changed the whole viewpoint superb sir

[@europaepsilon7970]

Hello Wayne Breslyn, before I tell you why I commented I want to tell you what I think the meaning of life is, the meaning of life is to know as much about the world around you so that you have the advantage over others to manipulate it (knowledge is power) At 2:05 when you explain why water powers at a lower temperature at higher altitudes I feel like I unlocked a piece of knowledge about the world. For me the whole reason I even care is because if I ever go camping high in the mountains with friends and I boil water I have the knowledge to explain why the water boils faster. I have the power to educate others because of you. Thank you. Some people take for granted that they live in the Information Age, in a time where you have access to learn about (almost) anything about our world and the universe.

[@physiobob1]

This is a really nice description of boiling and an important concept in human physiology and a great segway to understanding absolute and relative humidity... Have you ever thought of doing a video on those concepts?

[@Sonu-ye5ux]

This video is really helpful sir. Our teachers don't tell the concepts behind the facts but you have explained all things. I saw a lot of videos on KZbin for vapour pressure and boiling but nobody explained so nicely like you. This 6 minute video really failed 1-2 hours lectures..... 😎😎 Thank u sir for making such helpful videos.

[@wbreslyn]

This is one of my best videos!

[@brennanmasaoybren2404]

This is the most creative way to describe these things! thank you so much for this!

[@wbreslyn]

Thanks for the kind words!

[@sherazkhan2802]

Finally , I got what actually boiling is.... Thanks a lot ... I had a misconception .

[@donjet5371]

At 1:20 you say "only 50 kilometers has enough air for humans to breath." But 50 kilometers is approximately 31 miles; and 26,000 feet (8,000 meters or 4.9 miles) is the official ‘Death Zone’ where severe altitude sickness occurs without the use of supplemental oxygen. Other than this bit of confusion, the video is really good. The best explanation of boiling I've ever seen.

[@wbreslyn]

Hmmm. You make a good point!

[@khyatisharma3437]

Wonderfully explained. Only Video on this topic with so much clarity. Seriously thankyou very much.

[@wbreslyn]

Thanks for the kind words! --- Dr. B

[@stharnlee9010]

Came here to try to understand the concept of Vapour pressure, nd I understood a lot more things than I was expecting, thanks so much.

[@wbreslyn]

Great to hear!

[@chaktirose]

This was a well done video. Thank you for taking the time to make it!

[@wbreslyn]

Glad it was helpful!

[@priyalbhardwaj696]

Finally something that was confusing me a lot is clear Thxx✨

[@trilus9199]

Thank you soooo much for giving us a clear explanation. It's really helpful to understand about boiling point and pressure more clearly.

[@wbreslyn]

My pleasure 😊

[@priyankabhargava7842]

Thankyou. Lots of love and respect🙏😊

[@amiraboodi2075]

thank you very very much. this video helped me so much and answered my long-time questions. I'm a mechanical engineer.

[@Bible_means]

No words.its most valuable teaching.

[@wbreslyn]

Thank you!

[@karthikchowdary6649]

thanks a lot,everything explained that i had a doubt about.u earned a like.

[@AZLANAWAN_56]

This channel is a miracle undoubtedly 💙

[@wbreslyn]

Thank you!

[@shyamkiran397]

Finally a good one to understand this confusing concept🙌🙌

[@wbreslyn]

Thanks!

[@anmolgupta-bj5ce]

Clear and conceptual explanation thank you sir 🙏🙏🙏🙏🔥🔥

[@toobahussain6492]

Thnku so much for this video ...it made my concept clear..

[@clairenime]

I appreciate the video. Have a test tomorrow where I need to be able to explain this, but and this does a great job, I think my understanding on this topic got a lot better, I liked the visuals too.

[@wbreslyn]

Excellent and all the best on your test!

[@armaletalia3254]

What an excellent video!

[@VARS-er8xc]

best explanation ive come across on boiling point

[@wbreslyn]

This is one of my best videos!

[@Rahul-oy1vo]

Hello Sir , I wanted to ask when we have the vapour pressure above a liquid and also an external pressure acting on it(eg atm pressure) , What is the total pressure acting on the liquid at that time?

[@aman7153]

You are really amazing teacher sir. I am in class 12th (india) but didn't know the real Concept but the way in which u explain is outstanding. Hat's off to u sir

[@wbreslyn]

Glad I could help!

[@Jordan_Dossou]

Wow. Such a great simple explanation, but in depth too. Helps for AP chemistry. Forgot my honors chemistry

[@wbreslyn]

Thanks and all the best in AP chem! --- Dr. B

[@mni7928]

Finally,find it. Absolutely great work. Thank you sir

[@wbreslyn]

Glad I could help!

[@user-qu6oc2ej2x]

does vapour pressure act only against the air molecules and not on the surface of liquid?

[@karmayuki9144]

Thank you. This has cleared up my confusion😊

[@Rahul-oy1vo]

I have a doubt hope you would help. When the vapour pressure and atmospheric pressure are equal boiling takes place, what is the total pressure acting on the liquid water at this condition?

[@VEAR31]

I have a Liquid Oxygen container at -196C, as per heat transfer I calculated a vaporization daily rate of 0.1036% at ATM pressure. if I increase the container pressure to 0.1519 kg/cm2 how much will the vaporization rate decrease?? How can I calculate this? I'm kind of lost, I was trying to use this ecuation but then I think probably is not the right one for my problem.

[@subashchandrabose3274]

if water vapours are pushing against atmospheric air means they also push water down there, since pressure acts normally in all directions. How would this be correct explanation?

[@kubramali4749]

thankx for an amazing explanation. ..amazing help for class lecture~

[@virenderbhardwaj3137]

but why temperature becomes constant during boiling and doesn't increase further even on adding heat?? if its just the game of bubbles it doesn't the explain why the temperature can't rise further ,,,if I say that below 100 degrees the energetic water molecules forms bubbles but those bubbles don't have that much vapor pressure so it collapses but at 100 degrees they have enough vapor pressure to escape but even above 100 degrees the bubble have more pressure right? and more bubbles will form because there will be more no. of enough energetic molecules ....so why it doesn't rise above 100 degrees ?

[@NainaTripathi-vh4ty]

Ohh myyy goshhh!!! This video is a life saviour 😲😲😲😲😲

[@sabinakoirala7268]

How does water vapour form? Please make video on this topic.

[@anmolguptanm7515]

I m so curious to know what is boiling point, and I get the feel of boiling point. I appreciate your efforts

[@gvancuren]

How does the boiling water choose which molecules to turn into vapor first. I do not believe it is random.

[@arnauabfabf7400]

Excelent video. Thanks

[@dipendramaurya222]

Best n simple for understanding 😊

[@kAreemMohamed-zc6bm]

how to form vapour pressure while the atmospheric pressure prevents bubbles to form ?. u said bubbles form the vapour

[@sabinakoirala7268]

Sir does low atmospheric pressure decreases van Der wall force?

[@lamalamalex]

I’m a little confused. Certainly the amount of energy I have to give the molecules to break their hydrogen bonds isn’t dependent on the pressure of the atmosphere and yet it’s true that water boils quicker at lower pressures. What gives?

[@janette9944]

Love how he explains it simplefor kids to understand

[@Singingplus2]

Wow brilliant 👏👏sir I under Crystal clear this topic

[@joshiifruit5554]

Thank you so much! So easy to digest and understand. Really appreciate it

[@wbreslyn]

You're very welcome!

[@logicalparadox2897]

Correct me if I'm wrong, please ... But isn't water in its gas state called steam? Isn't water VAPOR what we call water that should be liquid but is in a gaseous state, like when it condenses into fog/clouds? I thought that steam is what is in the bubbles in boiling water and coming off the surfaces, but that the stuff we see is actually water vapor which happens when the steam slightly cools and starts condensing back to liquid drops suspended in the air. Am I just confused?

[@mchkenshin4886]

Increasing vapour pressure decreases atmospheric pressure but it can also increase the net pressure on liquid surface right how can we say that net pressure decreases just because atmospheric pressure is decreasing?

[@tocabenny2821]

Thanks about this information about boiling. It was so useful 😃😊👍🏻😄

[@helenchen6308]

I feel there should be more said about what exactly it is and what causes it to go up and down.

[@yolanankaine6063]

Very well explained

[@pittaganesh3942]

No words guruji...I saw miracle...I saw a wonder....👏👏

[@wbreslyn]

Thanks for the kind words!

[@therealsan9949]

he is best in this business!!

[@kanchanthakur7428]

Thanks for such a nice explanation

[@wbreslyn]

Glad it was helpful!

[@NiharikaAChirayil]

Thanks for the video it helped me out a lot!

[@wbreslyn]

Excellent!

[@xcoffa9609]

Thanks for the vid really elucidated everything

[@wbreslyn]

No problem, elucidating is my thing. --- Dr. B

[@HamzaAlgderi]

Why water and vapor temperature are same at boiling point.... Explain?? Merci beaucoup **

[@alialkofee1]

Thanks a lot . this cleared some stuff up

[@eduardoquiroga6804]

I was curious about that, it pretty cool.

[@upsidedown2240]

THANK YOU for explaining it completely! apparently some geniuses don't care to explain the effect of Atmospheric pressure on liquids, which made it frustrating to understand :/

[@wbreslyn]

Happy to help!

[@haimz3854]

Thank you very much!!! great explanation

[@wbreslyn]

Thanks! --- Dr. B

[@ahmetozbekler]

Very simple, very clear and very good explain for understanding. Thanks 👍👏👏👏👌

[@wbreslyn]

Glad it was helpful!

[@alicewonderland9254]

This is a great explanation!

[@wbreslyn]

Thanks, this is one of my best videos! --- Dr. B

[@rojadaki]

Isn't 50 km a bit too much of a height for humans to breathe? Or even 10km? 1:20

[@jahnavipunna7581]

You have explained this sooooooooo well!!!!!!!!😮😮😮

[@wbreslyn]

Thanks for the kind words!

[@wijayatan7870]

can water heated to 400 celcius in room temp

[@trishaseal7782]

Thank you so much sir, concepts fully cleared!

[@wbreslyn]

Excellent!

[@statewidefilms]

I am truly amazed that water molecules can expand when heated and separate a huge amount of air that can form an air bubble or is it water vapour ? When I look at a cold container of water there is clearly no visible trapped air . Then when heated there is an unlimited amount of ( air ) bubbles until it boils dry ? It looks like the best magic trick . ?

[@Rick_Pi]

Great video ❤😊

[@Saymyname-f1i]

❤🎉 You earned my subscription thank you

[@SyedaFareeha-mc9yw]

Thanks alot Such a nice explanation

[@wbreslyn]

You are most welcome!

[@Indhumathi-vb2xg]

I loved the explanation! Tysm😊 U got a new subscriber 🤍

[@wbreslyn]

Awesome, welcome aboard!

[@muhammadafiq4403]

when water molecules leave from water surface they will create pressure called vapour pressure isnt this already reach the boiling point of water bcs the water already deliberate bubble. Sry for my english. Hope to hear the answer from you.

[@missionimpossible8961]

Genius explanation

[@wbreslyn]

Glad it was helpful!

[@muhammadishraqalishah4059]

Best explanation sir :) Thank You

[@wbreslyn]

You are most welcome!

[@aswinjomike9466]

Awesome vid man.. U got yourself a subscriber!😍

[@wbreslyn]

Welcome aboard!

[@chonk_fox89]

Hi! Great video! I have a question about when the water 'boils' in the syringe, you said that was boiling with no increase in heat...is the boiling just the creation of the air bubbles and not heat? Or would heat have occurred eventually in the syringe?

[@wbreslyn]

The pulling on the syringe creates a vacuum. That makes it easier for water molecules to spread out and change into a gas. Some of that happens in the water - those are the bubbles. Heat won't be created by this process - the water actually gets colder. You can even use a vacuum to make ice (here's a goofy video someone did showing that happening: kzbin.info/www/bejne/aKbKoaKlfN-ZiJo).