Atmospheric Pressure and Boiling

The pressure of gas above a liquid affects the boiling point. In an open system this is called atmospheric pressure. The greater the pressure, the more energy required for liquids to boil, and the higher the boiling point.
Higher Pressure = More Energy Required to Boil = Higher Boiling Point
In an open system this can be visualized as air molecules colliding with the surface of the liquid and creating pressure. This pressure is transmitted throughout the liquid and makes it more difficult for bubbles to form and for boiling to take place.
If the pressure is reduced, the liquid requires less energy to change to a gaseous phase, and boiling occurs at a lower temperature.
See chemwiki.ucdavi...

[@ibrahimvardag8685]

This topic has eluded my understanding for quite some time and you have explained it within 3 minutes. Any form of thanks would not be enough for the service you have done for me now. All I can say is thank you so much. Please keep up this good work. Educating the masses is a very noble job and it is my belief that you will be rewarded heavily for this in the afterlife.

[@planet287]

00

[@sharalasoren4907]

Wow my doubt cleared in an instant. A thumps up

[@wbreslyn]

Glad I could help - atmospheric pressure and boiling is a tough concept for many. --- Dr. B

[@sir1694]

@@wbreslyn thanks for this amazing video . I like that experiment of low pressure boiling. Thanks again

[@sumudunadeera8451]

Mine too

[@vishalsingh8143]

sahi bola didi ne🙂

[@itsanoynomous3253]

This is what KZbin made for .... Great Explanation Thank you

[@cedricstokoe7624]

In my IGCSE book the definition of boiling point is the temperature at which the pressure of gas created above a liquid equals atmospheric pressure. The question is whether all gases after the boiling point (Ex: Hydrogen, Nitrogen, Oxygen) exerts/equals the atmospheric pressure?

[@Satishbamaniya21]

I watched a lot of videos to understand this concept but failed to understand but after watching your video the concept is crystal clear. Great explanation thank you very much.

[@wbreslyn]

Thanks, this is probably one of my best videos!

[@Xanderviceory]

Thank you for making this video. Ive had atmospheric pressure and boiling point relation explained many times to me but people always explained why its related not HOW it works like in this video. 5 stars :-)

[@wbreslyn]

Thanks, this is one of my best videos!

[@senguloguzbayrak3491]

Mesej yang jelas, struktur yang jelas, mudah difahami, terima kasih

[@wbreslyn]

Tiada masalah! Gembira dapat membantu!

[@Shumymiles]

i have a question... does adding or decreasing pressure to air molecules make them at any time smaller or bigger in size? or does the just the space between the molecules grow and contract in size?.... basically, i want to know, that under extreme pressure does the actual air molecule get smaller?.... example, if any air molecule was the size of a tennis ball under low pressure, would that actual air molecule shrink to the size of a ping pong ball under extreme pressure?

[@dionysusfury3879]

this is so cool!. just tried and saw myself. So isoptops under lower pressure move from liquid to gas and the water become isotopically heavier.... that was my original reason to come to the video

[@anano4300]

Could you please come to my university and be our teacher In physics? So far you're the only one who have managed to explain this topic to me

[@vishnuvasu7558]

thanks for the video and knowledge. boiling is not a function of temprature

[@madalincalamanciuc6656]

vishnu vasu that's what i was looking for too. Studying Physics/Thermo right?

[@makimako8652]

Temperature is not how hot or cold something is. Temperature is the average speed of the molecules of something. Heat is energy which makes things move. The higher the temperature you have, the more kinetic energy you have and the more you move. When you have more energy, it is easier to overcome the atmospheric pressure, just as when the atmospheric pressure decreases, it is easier for things to boil (it takes less energy).

[@khaliffoster3098]

So, it does match Newton's Third Law for equal and opposite reaction that is, the wider the action, the reaction is wider as it decreases in temperature, that is the molecules of something that is closer or farther. And it matches Newton's First Law that is an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force, so the unbalance force is higher altitude where there is lower pressure above or lower altitude where there is higher pressure below. So, it is all about pressure that causes temperature, and of course at higher altitude, there is higher motion at lower pressure since gas and liquid has more to move. So, law of motion base on higher altitude the lower motion of molecules, so take less energy to create higher motion of molecules. The opposite is true for lower altitude. Which you say easier to boil since lower pressure, which air itself is a pressure that is not interact with other air that cause higher motion that create more pressure from air itself same as balloon expand so more energy in balloon at higher altitude as it explodes. It is opposite of solid and gas, so the more pressure for gas, the less energy of gas. For solid, the more pressure for solid, the more energy of solid. So, there is opposite for gas and solid for law of motion, when I say opposite that is opposite of pressure that create the motion. That is unbalance force. So, gravity is not needed because gravity is even all over, which the unbalance force is even all over, which there is a different feeling downward for any mass, that is the lighter mass, the harder motion for lighter mass. The point the unbalance force do depends on mass itself and mass itself must be constant, so the earth as a mass that is same is constant, yet not constant on us, so we move comfortable and we can move, so it breaks law of Conservation of Momentum which break the balance energy so there is an extra energy from same momentum (same force, speed, motion, etc). So, logically there is even force above us, not from below us that is being pulled on us, like a magnet, a magnet that create force energy that attach something or repel or in another point of view it pull or pushes. So, there is a hard force above us that hold everything. Gravity is not hard force but soft force that is seemingly intelligent since it can do illogical things. Like water can flow out of sink and being shut off from sink, it can't do itself that would be illogical, so it has intelligent that can decide to change the imbalance force to turn on or off. Gravity is same imbalance force and do not change. The point gravity has illogical imbalance that doesn't even out between two in an even way. So, you might process to conclusion base on temperature, but might jump to conclusion base on gravity. What I say make sense so don't jump to conclusion because it is common, just look beyond the common and see what is logical and illogical after all, humans are not entirely logical beings, so they at most of time can be illogical which more prefer base on emotional react, not logical react. Logical is balance, emotional is imbalance, so nothing wrong with imbalance as long as it is right imbalance. Pressure will seek pressure; non-pressure will seek non-pressure; two different pressure will seek two different pressure, what I mean by that when a balloon go up, the interact of two momentum that is air balloon, the balloon itself will seek lower pressure because air outside that is third momentum has lower pressure above. So, it is about balance. So, to process to conclusion is a sign of wisdom, which means absorb what I type, not rebel, or in magnet term, to attract or repel. Gravity is not base on real world which it is repeat and can do yourself, but depends on NASA and people that support NASA. What is not repeat means it is not real for law of nature since law of nature is always there and everywhere.

[@jaymayhoi]

amazing simple and easy to understand! thanks

[@Ayce47]

Thank your very much! This was the best explination I found on the internet!

[@wbreslyn]

My students and I worked on this video for some time. Atmospheric pressure is a tough concept. Good to hear it helped! --- Dr. B

[@Ayce47]

It didn't just help. it was so clear to understand that after watching it, it redefined in my head what happens to matter while switching states. These kind of short, clear and well structured videos are THE best way, at least for me, to understand the things around me. If i were to add one thing to the video, it would be an easy analogy in order to understand it even easier.

[@gunjanbarman2965]

Yeah , so true....

[@abeehaahmad9479]

Thank you very much 😊 this was too helpful in this time as we are studying from home 😊👍❤️ Wishes you ability to make new video 😉

[@wbreslyn]

My pleasure 😊

[@madmedicos3759]

Thank you so much This video helped me very much

[@kaymanclark9704]

Thanks! A perfect video to explain to my 7yr old who love science

[@jellezwart9155]

I have a question: if you were to boil water in a low pressure environment until it was all gas, would it still be gas if you turned on the pressure again? Thanks

[@wbreslyn]

Good question. In a closed system I would expect the gas should go back to a liquid. But to create a vacuum we pull out all the gas to lower the pressure. So from a practical standpoint I'm sure how to demonstrate this.

[@Pskditbbank]

This video explains the principle logic of evaporator as well. Thanks for this video

[@DaraGeoghegan]

Brilliant video. Cheers

[@WennieBoy01]

Thank you! Armstrong Effect fully explained!

[@juliannemora7334]

Thanks for the explanation! Really helped! c:

[@Rakeshksingh8322]

Sir can we say that atmospheric pressure is directly proportional to boiling point

[@AbhilashNairSpartnax]

The plunger demonstration was cool ngl

[@sabinaeasmin5524]

Wow, thank you it's really helpful

[@wbreslyn]

Most welcome!

[@GeorgiaAndrea]

*serious question* So in space, if no water is able to stay in liquid form, let's say an astronaut is exposed to vacuum, his blood and other bodily fluid will boil, but since there's no heat, is he in a serious amount of danger if his bodily fluid is in that state? I'm guessing he is because he is going to be totally dehydrated and dry out completely?

[@wbreslyn]

Serious danger, yes. But you wouldn't die instantly, or freeze. Check this article out... www.scientificamerican.com/article/survival-in-space-unprotected-possible/ --- Dr. B

[@omarshahin3288]

Your body produces enough heat to boil your blood at high altitudes, thats why astronauts wear pressurized suits.

[@muhammadzulqernain8903]

Nice question. I think, you're right. The astronaut would either be dehydrated at once because of the vacuum or his body may expand (possibly explode). The air of the body would be pulled out by the vacuum and the remaining oxygen trapped somewhere in the lungs may try to expand by pushing the body outwards. Seriously horrifying.....!

[@Arandomguyat1]

Best explanation hands down

[@wbreslyn]

Thank you!

[@technoisehacks3478]

Thankyouuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu upto infinite Tha kyou so much sir my pleasure I found you and you put that video 🙏🙏🙏🙏🙏

[@wbreslyn]

Most welcome 😊

[@TheReal4th]

This was so informative!!! Thannk you!!!

[@wbreslyn]

Excellent! --- Dr. B

[@simabegum8806]

Thank you for clearing my doubt.

[@wbreslyn]

My pleasure!

[@miraculoussimpson6785]

Thanks! This really helped.

[@wbreslyn]

Excellent! --- Dr. B

[@manojkumarchaudhary9352]

good informative video

[@Hannahselim]

What is the boiling qnd freezing point of water at atmospheric pressure?

[@thedeathcake]

Brilliant video

[@wbreslyn]

Thanks!

[@sadiqshaikh8715]

0:49 the books are the current educational system and can is students

[@hamzakhalid4613]

🥲

[@y_p7]

Very nice voice and explanation !

[@wbreslyn]

Thank you! --- Dr. B

[@theholyrat9482]

Thank you so much

[@Casry12345]

SO WATER BOILS FASTER AT A HIGHER ALTITUDE? OR NO?

[@markmiranda3364]

so it doesn’t heat up the water? yeah? it just boils?

[@IMTGAMER-mi7jn]

NICE

[@SIDEKICKONYOUTUBE]

so even though its boiling but not hot, will the water vaporized and eventually be empty like when boiling water by heat ?

[@wbreslyn]

Yep, the bubbles that rise to the top are full of water vapor which is released into the atmosphere. After a while all the water will have changed to vapor and escaped. --- Dr. B

[@SIDEKICKONYOUTUBE]

i see thanks for clarifying.

[@timepass3207]

thankks it helped me :)

[@ramkoirala2766]

thanks sir u gave hu humongous knowledge

[@wbreslyn]

It's my pleasure!

[@arunaravind8909]

If we close the top of the jar , the pressure will increase inside. If we close the jar what would be the temperature of water

[@wbreslyn]

Not necessarily. If everything is at the same temperature there shouldn't be any change (unless the temperature is increased around the jar).

[@bartvandenhurk6674]

Thanks for this awesome video. It helped me a lot.

[@wbreslyn]

Excellent! --- Dr. B

[@Ta3iapxHs]

0:43 I don't get your point with the books and the can. What do you mean?

[@Ta3iapxHs]

​@Adam Gordon Thanks for the reply, OK I got that. What I meant was this. He was saying: "..the more air above you, the more pressure. And pressure makes it more difficult for boiling to take place. Think of it like these books. (etc.)" I don't see the analogy between boiling and pressure and a can with some books above it.

[@Ta3iapxHs]

@Adam Gordon OK this analogy makes some more sense now, thanks.

[@Ta3iapxHs]

@Adam Gordon lol ok

[@pedropabloarango]

50 kilometers above MSL does not have enough air density for humans to breath, at 38.000ft / more or less 12kms you will die in minutes

[@wbreslyn]

Doesn't sound like much fun ...

[@NARESHVIDEOS]

Wow thank you soo much

[@kadalisriramprasad351]

As if we decrease the outer pressure also they have their respective wander wall forces know then how they are being evaporated..?????? Plz anyone

[@Arandomguyat1]

Can you please create a video on force and gravity ?

[@wbreslyn]

All clean on my list!

[@privatedeletebuttongooglei5221]

Would you please translate from kilometers to miles?

[@xyzsccr]

Great video, really helpful!

[@wbreslyn]

Thanks, this is one of my better science videos... --- Dr. B

[@suhaibwani6732]

Great

[@preetishingare5756]

excellent explanation!

[@wbreslyn]

Thanks! --- Dr. B

[@n.stokas1942]

Your parents may live 1000 years😊😊😊

[@Debz.07]

I thought the higher the vp the lower the bp!?! Confused please explain. It's saying the higher the pressure the higher the bp now?

[@wbreslyn]

So the higher the vapor pressure the more difficult it is for the liquid to boil (molecules leaving the liquid have to push against the pressure to leave). This means that the liquid must be at a higher temperature before it will boil. So we say it will have a higher boiling point. Hope this helps ... Dr. B

[@muhammadzulqernain8903]

@@wbreslyn Thanks for the video and further explanation....! Well, I've a doubt about this explanation. We've studied that boiling point is the value of temperature at which vapor pressure of the liquid becomes equal to the atmospheric pressure. My question is, "if the vapor pressure of a certain liquid is already high, doesn't it need rather lower amount of heat and thus lower temperature to boil out?"

[@wbreslyn]

@@muhammadzulqernain8903 So if it has a high vapor pressure it will boil at a lower temperature. So yes, it would boil out at a lower temperature. Fascinating stuff to think about!

[@trishagoswami5817]

helpful one :)

[@wbreslyn]

Glad it helped!

[@dumbreon_plays2139]

Thanks for explaining it! Btw the dislikes are from Australia

[@wbreslyn]

Yeah, I kind of figured they were.

[@orangecaprinun]

wow, never understood this until now

[@nibeditapattanaik3751]

Thanks a lot for explaining this. Shit had me confused as hell

[@alialrefee2163]

I get the bubbling but why does is evaporite?

[@wbreslyn]

Evaporation is the water vapor escaping from the surface of the water. Boiling is something that happens throughout the liquid and when the bubbles reach the surface they release the water vapor into the atmosphere. --- Dr. B

[@Kaspar008]

first fact of the video. Only about 50 km has enough air for humans to breathe, not accurate as we would need supplemental oxygen to avoid dying in minutes above 10 km

[@Ngormaketh]

Wow 👏🏽👏🏽

[@joshuaschertzer7133]

POV: you're failing chemistry

[@wbreslyn]

Hang in there!

[@hajar.h6207]

thank uuu sm

[@wbreslyn]

You are welcome sm!

[@CBBeresford]

Space gives you a whole body hicky. Got it.

[@johanasava4502]

Thank you sir it was very clear

[@wbreslyn]

You are welcome! --- Dr. B

[@premkashyap9579]

thanx

[@kazthecanadian94]

coooool good 2 know.....

[@davidlundmark8477]

Ayyuo big old sad rEaCTs to people at high altitude. Lots of love bitches stay wild my children. Xoxo Gossip grill

[@briansmith4853]

Al dente

[@privatedeletebuttongooglei5221]

Crying sub because amanda committed suicide

[@carterkapusta1155]

Good meme

[@cacteyes9432]

Go back to politics, George.

[@kc5881]

I disliked.thank u

[@wbreslyn]

No problem! Any reason why?