Vapor pressure | States of matter and intermolecular forces | Chemistry | Khan Academy

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Vapor pressure, volatility, and evaporation.
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Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a first-year high school or college course, and a good understanding of algebra is helpful.
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1 сен 2009

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Комментарии : 141

@inezraharjo 12 лет назад

"if you leave water outside, it will evaporates, even though, hopefully, in your place, is below the boiling point" LOLOL

@vishalmali921 5 лет назад

Finally ... I got what vapor pressure really is. Thanks Sal.

@dragooner4 12 лет назад

this answered my great questions. It's like one of those questions that you had when you were a child and then suddenly when you learn about it it all makes sense. This video answered that question for me.

@limesther7000 2 года назад

I was literally hunting around everywhere to find a good explanation of vapor pressure. FINALLY I understood it!!! Thank you so much Sal, half of my educational career credits to Khan Academy

@tahiraprogga7367 4 месяца назад

Half?

@anoelst 10 лет назад

Khan for president!

@benjaminion. 8 лет назад

+tonio noel of?

@Mae-nw6cv 4 года назад

Benji COC/CR of teaching

@dudemanismadcool 8 лет назад

got away with two fluids courses and currently in my third thinking I understood vapor pressure only to find out now I didn't. Legendary explanation thanks mate.

@Tasniaaaaaaaa 11 лет назад

Sal, thanks for doing what my teacher apparently doesnt know how to do-teach.

@zitscx886 3 года назад

Don't let the teacher lead you. Let your curiosity lead you.

@kevinikeda8394 3 года назад

You replied to an 8 year old comment, nice

@atiyagardezi7918 2 года назад

Hello guys

@smellyfish4699 Год назад

Hello

@maahinsethi8330 Год назад

hello

@shardaejoseph6516 8 лет назад

this was extremely helpful thank you Sal. i don't even have to read my notes. lol

@Diminisch 14 лет назад

Studying for MCAT, this video really helped me with this subject, Thank You!

@evagao2331 7 лет назад

Really good explanation. Thank you very much for making these videos!

@j9312 12 лет назад

seriously you'v got some serious skills with a mouse dude.

@yuudesu 3 года назад

You alive mate?

@kevinikeda8394 3 года назад

They’re all dead no

@atulanand1337 3 года назад

@@yuudesu Why do people always think that commenters of old comment will be dead? If he/she was of roughly 20 years (considering the topic being taught in this video), that person would be about 30 (far from the average life expectancy).

@yuudesu 3 года назад

@@atulanand1337 bruh that's just a joke ..don't take it seriously

@Livingbeing01 3 года назад

I LOVE KHAN ACADEMY

@NilanjanaLodh 13 лет назад

thank u sooooo much! u made it a lot more clear!earlier i was just confused about the relation b/w bp and vp .and i really love ur teaching style!

@BBLitchi 11 лет назад

Thank you. I finally understood what vapor pressure is. Believe it or not, I was struggling to understand the concept of vapor pressure for 3 years until I came across your video. Thank you again!

@YouWM 14 лет назад

I'm a student of Technical Chemistry and know all those concepts, but those videos are so unbelievably intuitive and well explained! Congratulations!

@deepprakash4841 8 лет назад

thanks a lot!!!!!! just understood the concept! thanks a lot...............

@khyativerma42 2 года назад

This was the topic none of my 3 chemistry teachers could teach me and sal Khan taught me in just 18 minutes.

@okccitizen4400 5 лет назад

Thank you for what you do

@MrCordezzz 12 лет назад

Thank you so much for the time you have put into these videos. They are really helpful.

@AdityaMishra-vy8re 4 года назад

Thank you so so much ... I could finally see all the pieces coming together.... U literally made me cry.... Beautiful explanation😍😍😆😆

@espejitos15 11 лет назад

Very well explained.Thank you!

@VistarMonei 14 лет назад

So much clearer than the notes my Chemistry teacher gave me... I'll be sure to watch these videos before doing my homework for next time, too!

@MrCooldude4172 10 лет назад

Thank you so much you really helped me for year 1 Uni.

@gdogvibes1 9 лет назад

perfect.

@marcelo497 2 года назад

The inability of my chem teacher to explain this brought me here, but at least now I can say that I understand it. Thanks fella

@Piou_le_petit_ours 3 года назад

Nicely explained. Detail but interesting, the amount of energy on the particles follow a maxwell boltzmann distribution and not a normal distribution. But same idea, some have anough energy to break out, while most dont (during evaporation).

@MrPaolosio 5 месяцев назад

Brilliant. Crystal clear. Thanks :)

@mybirjitthangjam7388 5 лет назад

Thankuu very much

@dill_lift 13 лет назад

Thank you so much! I have a test in 30 mins and this video helped a lot!!! Keep up the great work! You explain like a beast :p!

@troychavez 5 лет назад

Khan, YOU ROCK! THANK YOU!!!

@oXmichikoXo 12 лет назад

Thanks for the lecture!

@DaveHowardvideos 14 лет назад

This is great information and very well explained.

@larissashen4874 6 лет назад

Very interesting facts about how matter is always changing. It really helps me understand just how weird living things are for trying and managing to keep things stable.

@frogspasm 14 лет назад

Great videos a lot clearer than my textbook. These videos have helped me a lot. Yhank you very much

@anton_s1 Год назад

This video is amazing. Everything makes so much sense now. You are a hero!

@satuwesterholm5058 6 лет назад

Thank you so much!

@vishalvala4788 4 года назад

Thanks for uploading.

@iaminvisible5659 6 лет назад

Appreciate it!

@virupannamedikinal Год назад

Really helped me a lot

@hitendraverma5079 12 лет назад

nice information man...........................

@kevluv93 12 лет назад

I won't lie to you Sal, if it weren't for you I would have probably failed college. Thank you

@techfive7202 5 лет назад

I'll take your word for it. Thank you

@YoungKiIIaX 10 лет назад

The only problem with how you teach is that sometimes your words just jump.

@jullysrandomvlog4702 4 года назад

that was a great help .............thanks a lot!!!

@sheilavicentedasilva3145 6 лет назад

Wow ...👏👏👏

@BraulioCLBF 6 лет назад

The best video!

@robjows 12 лет назад

I don't understand how the vapour could push the atmosphere if its pressure merely equals atmospheric pressure, wouldn't it need to exceed atmospheric pressure to move it?

@crazychemistacademy979 3 года назад

Incredible

@curtpiazza1688 11 месяцев назад

Great explanation of the graphs! 😅 🎉

@cayamb 2 месяца назад

KHAN IS THE BEST !

@Be1smaht 12 лет назад

congrats!!!! what u use for veral?

@16velvet 14 лет назад

thanks!

@cousin13pro 14 лет назад

wow thanks man

@atharvat223 6 лет назад

really good video

@farzee 7 лет назад

please explain separation in reciprocating pumps and how it relates to this lecture on vapor pressure..can you please make a video on it..if you already have a video on it..plz reply with the link here..thanku so much for this video here

@hdkwon64 2 года назад

best video thanks

@meylinmuniz4510 6 лет назад

To determine vapor pressure do we look at how strong the intermolecular forces are or the concentration of solute?

@bellacanque9566 3 года назад

Thanks Sal ☺️

@sciencenerd7639 2 года назад

thank you

@gauravGupta-bk2sw 7 месяцев назад

Only patience 🙏 can help someone watch this lecture, I'm giving up 😔 too much info god 🥴😮 just not in d mood tday Too lazyy to write any..thi..ng...elsee....aah!!

@5gallonsofwater495 8 месяцев назад

Holy, as soon as he said heat of fusion I suddenly understood everything. Thanks from an electric engineer

@rajanparthipanbalaraman6736 8 лет назад

சிறப்பு

@smitrib 12 лет назад

So does water or gasoline have stronger IMFs? Water is polar, while gasoline is nonpolar.

@CallofDutyNOOB1 11 лет назад

so does a high vapor pressure also means that this liquid will have a low boiling tempreature?

@mclarenjoao1049 4 года назад

Indeed

@chinmaykumarpatra3785 10 лет назад

really understood.

@kisskisskiss121212 11 лет назад

It is spelled vapor in America...

@txfury4753 4 года назад

Ohhh now I finally get it

@expoberries 12 лет назад

So, if the equilibrium vapor pressure is set to a higher temperature, and consequently, the rate of evaporation increases, then the rate of condensation also increases, correct? Because if each happens at in equilibrium, than the rates should increase and decrease along with one another? I'm not entirely sure, but the video did provide very good insight on the matter.

@kenseow005 10 лет назад

Thanks for the great explanation. One thing taught by my lecturer confused me. Is there something called "maximum vapour pressure" ? Or can I say the maximum vapour pressure can be achieved is 1atm? Since when they reached 1atm the solution will start boiling.

@clchoate24 11 лет назад

Looks like John Madden's attempt at showing vapor pressure haha

@nitinchetla9970 2 года назад

10 videos later and finally someone explains why vapor pressure ends up pointing "up"

@arwaaomran9093 7 лет назад

you said that at the point when the vapour pressure is equal to the atm. pressure we reach the boiling point of the fluid then on the chart of different fluids you said that propane will boil at 20 degree celesius as its vapour pressure is much higher than the atm. pressure ?? so do you mean that boiling point will be at the point of equilibrium or higher ? and also why does propane molecules continued to evaporate and exerted much higher vapour pressure than the atmoshpheric pressure ?

@rickmcn1986 Год назад

I don't know if this can be explained like this without the concept of partial pressure. Vapour pressure of a liquid equals the partial pressure of the vapour just above the surface at equilibrium. The pressure itself just above a liquid open to the atmosphere is going to remain at about 1atm no matter what. When you boil the water the partial pressure of the vapour just above the liquid rises to 1atm.

@84salute 12 лет назад

Best video on Vapor pressure so far!

@maahinsethi8330 Год назад

11 yrs old

@maahinsethi8330 Год назад

comment

@Buildingscienceacademy 2 года назад

3:15. Is there a name for this yellow line? (The point where there’s enough to escape)

@curiouskiddo6885 6 лет назад

@ 0:42 shouldn't it be heat of vaporization? Where am I going wrong?

@bublzmcbublin8317 4 года назад

When you mention overcoming the heat of fusion @.41 into the Video, shouldn't it be the heat of Vaporization, since you already mentioned we are starting with liquid.

@hussam023 11 лет назад

8:00, its vapour pressure not vapor pressure.......a gr8 video, understood everything. :D

@lavanzentgraf 2 года назад

The atmospheric pressure of a butane lighter is 3.5 the earth normal atmospheric pressure

@HimanshuSharma-kq7kh 3 года назад

What is the relation of food cooking in a pressure cooker with vapour pressure (decreses, increases & external internal)?

@shaikqayum9699 6 лет назад

i have good standard problem

@lets_get_creative 11 лет назад

if water is kept open for ten years ,then it will disappear after 10 years

@engineerdr 13 лет назад

i didnt get how a greater vapor pressure can enhance the evaporation rate.plz help

@MafiaDiesel 8 лет назад

fatal mistake, atm goes down as you go higher in altitude, not up

@wxh2018 6 лет назад

At around 13:00 So when the vapour pressure is equal to the ATM does that mean that total pressure = ATM + vapour pressure?

@atiyagardezi7918 2 года назад

Yea

@rickmcn1986 Год назад

No. I think he is missing out the idea of partial pressure. If we have air and vapour, the vapour pressure is the partial pressure of the vapour above the liquid. At boiling the pressure just above the liquid will still be 1atm, but will consist entirely of vapour coming off the surface - the air will be pushed upwards.

@wxh2018 Год назад

@@rickmcn1986 Hahhaa thanks. 4 years ago wow, I've graduated engineering now. Wow xD

@KUVVAlTi 13 лет назад

Can u start all ove agine? cuz i havent understod anything

@patrickjohnson4648 11 лет назад

looks like an extremely complicated playbook

@nachiketbelwalkar1072 6 лет назад

whenever water or any liquid evaporates to atmosphere its temp reduces why? is it becoz the molecules possessing higher KE is escaped and overall KE of liquid is reduced? and why dont temp reduces when container is closed? still few molecules does escape from liquid..

@HimanshuSharma-kq7kh 3 года назад

When (1)Vapour pressure atmospheric pressure=====??????????

@madara.n 5 лет назад

I just don't know why I'm not feeling enthusiastic about my studies... All of a sudden there's this urge telling me to study and when I take the book into my hands, its gone... I wanna make learning interesting for me.

@yuudesu 3 года назад

Same mate, especially in this pandemic ;(

@kazsiddique1 2 года назад

is this guy the voice of one of the droids in interstella?

@nihayaturrohmah4230 3 года назад

#29

@karich21 10 лет назад

good example for this video would be a pressure cooker.

@Adriancatdad 10 лет назад

So in vacuum, water wouldn't boil?

@anamikavats2613 7 лет назад

Maiar The dreamer it would boil without you differing it's temperature .

@pradhikasotiya4207 8 лет назад

does anything which is a matter have some vapour pressure? as in solid,liquid,....!!!

@rickmcn1986 Год назад

Solids have extremely small vapour pressures, yes.

@benjaminion. 8 лет назад

Who are the 24 people that disliked this?

@ahumanbeingmybrain9791 8 лет назад

28 now.. well maybe that's because they probably hate chemistry and tried to understand the concept but still didn't got it then they got angry and disliked the video.

@nejatahmed1584 7 лет назад

a human being my brain 😁😂😂😂😂 interesting theory

@iMusikkForeva 6 лет назад

a human being my brain 😂😂😂

@shakeebqureshi7941 7 лет назад

Good

@omerzaman2373 7 лет назад

Lets say I have 10 molecules of water at room temperature (Supose). They collide and 2 of them gain enough energy to evaporate. Doesn't this mean that the 8 have less energy now and have less energy now. So "I THINK!" that they will get energy from surroundings and get back at room temperature and in the same way 2 will evaporate. Now lets say all evaporated and 2 left. Now they collide and 1 evaporates and 1 is left at room temperature. Will that one last molecule evaporate? If so how. Is this assumption that I made logical? Is there some quantity of water that will never evaporate from a glass?

@joeb8345 7 лет назад

Omer Zaman yes, when the vaporized molecules leave they take some energy from the liquid with it (hence why putting a drop of water on your hand feels cold, the water is "leaving" your hand and taking energy in the form of heat with it). The liquid will gain it's energy back from the surrounding environment, temperature permitting. -Joe. ChemE major

@engineerdr 13 лет назад

nice video sir.a cyber student from Pakistan

@flydiezz 12 лет назад

Thank you for the lecture, but i have a question that is bugging me and i would like to ask my fellow viewers - Is vapor pressure always in equilibrium? If not, can vapor pressure surpass that equilibrium?