Vapor pressure | States of matter and intermolecular forces | Chemistry | Khan Academy
Vložit
- čas přidán 1. 09. 2009
- Courses on Khan Academy are always 100% free. Start practicing-and saving your progress-now: www.khanacademy.org/science/c...
Vapor pressure, volatility, and evaporation.
Watch the next lesson: www.khanacademy.org/science/c...
Missed the previous lesson? www.khanacademy.org/science/c...
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.
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
For free. For everyone. Forever. #YouCanLearnAnything
Subscribe to Khan Academy’s Chemistry channel: / channel
Subscribe to Khan Academy: czcams.com/users/subscription_...
"if you leave water outside, it will evaporates, even though, hopefully, in your place, is below the boiling point"
LOLOL
Finally ... I got what vapor pressure really is.
Thanks Sal.
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.
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
Half?
Khan for president!
+tonio noel of?
Benji COC/CR of teaching
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.
Really good explanation. Thank you very much for making these videos!
this was extremely helpful thank you Sal. i don't even have to read my notes. lol
Sal, thanks for doing what my teacher apparently doesnt know how to do-teach.
Don't let the teacher lead you. Let your curiosity lead you.
You replied to an 8 year old comment, nice
Hello guys
Hello
hello
Studying for MCAT, this video really helped me with this subject, Thank You!
thanks a lot!!!!!!
just understood the concept!
thanks a lot...............
I'm a student of Technical Chemistry and know all those concepts, but those videos are so unbelievably intuitive and well explained! Congratulations!
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!
seriously you'v got some serious skills with a mouse dude.
You alive mate?
They’re all dead no
@@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).
@@atulanand1337 bruh that's just a joke ..don't take it seriously
Thank you so so much ...
I could finally see all the pieces coming together....
U literally made me cry....
Beautiful explanation😍😍😆😆
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!
I LOVE KHAN ACADEMY
Thank you so much for the time you have put into these videos. They are really helpful.
This was the topic none of my 3 chemistry teachers could teach me and sal Khan taught me in just 18 minutes.
Very well explained.Thank you!
Thank you so much you really helped me for year 1 Uni.
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!
Thank you for what you do
This is great information and very well explained.
Great videos a lot clearer than my textbook.
These videos have helped me a lot. Yhank you very much
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!
Brilliant. Crystal clear. Thanks :)
Khan, YOU ROCK! THANK YOU!!!
This video is amazing. Everything makes so much sense now. You are a hero!
Thanks for the lecture!
perfect.
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.
Really helped me a lot
The only problem with how you teach is that sometimes your words just jump.
that was a great help .............thanks a lot!!!
nice information man...........................
Appreciate it!
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).
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
Thank you so much!
I'll take your word for it. Thank you
Thanks for uploading.
The best video!
Thankuu very much
Wow ...👏👏👏
I won't lie to you Sal, if it weren't for you I would have probably failed college. Thank you
Great explanation of the graphs! 😅 🎉
Incredible
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
thanks!
Thanks Sal ☺️
best video thanks
really good video
thank you
சிறப்பு
To determine vapor pressure do we look at how strong the intermolecular forces are or the concentration of solute?
congrats!!!! what u use for veral?
wow thanks man
KHAN IS THE BEST !
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.
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?
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!!
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.
really understood.
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 ?
It is spelled vapor in America...
Ohhh now I finally get it
Best video on Vapor pressure so far!
11 yrs old
comment
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.
Holy, as soon as he said heat of fusion I suddenly understood everything. Thanks from an electric engineer
So does water or gasoline have stronger IMFs? Water is polar, while gasoline is nonpolar.
Looks like John Madden's attempt at showing vapor pressure haha
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.
10 videos later and finally someone explains why vapor pressure ends up pointing "up"
@ 0:42 shouldn't it be heat of vaporization? Where am I going wrong?
What is the relation of food cooking in a pressure cooker with vapour pressure (decreses, increases & external internal)?
i have good standard problem
so does a high vapor pressure also means that this liquid will have a low boiling tempreature?
Indeed
3:15. Is there a name for this yellow line? (The point where there’s enough to escape)
The atmospheric pressure of a butane lighter is 3.5 the earth normal atmospheric pressure
At around 13:00 So when the vapour pressure is equal to the ATM does that mean that total pressure = ATM + vapour pressure?
Yea
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.
@@rickmcn1986 Hahhaa thanks. 4 years ago wow, I've graduated engineering now. Wow xD
fatal mistake, atm goes down as you go higher in altitude, not up
i didnt get how a greater vapor pressure can enhance the evaporation rate.plz help
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..
Can u start all ove agine? cuz i havent understod anything
8:00, its vapour pressure not vapor pressure.......a gr8 video, understood everything. :D
if water is kept open for ten years ,then it will disappear after 10 years
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.
Same mate, especially in this pandemic ;(
looks like an extremely complicated playbook
Who are the 24 people that disliked this?
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.
a human being my brain
😁😂😂😂😂 interesting theory
a human being my brain 😂😂😂
good example for this video would be a pressure cooker.
does anything which is a matter have some vapour pressure?
as in solid,liquid,....!!!
Solids have extremely small vapour pressures, yes.
is this guy the voice of one of the droids in interstella?
#29
So in vacuum, water wouldn't boil?
Maiar The dreamer it would boil without you differing it's temperature .
Good
I guess they are dragging an easy topic into such complication. Dunno🤔
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?
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
When (1)Vapour pressure atmospheric pressure=====??????????
nice video sir.a cyber student from Pakistan
Im so stoneeedddddddddddddddd