This comment has made a century list . And I have to say you have made life easy to understand fluid properties in a more precise and lucid manner. Thank you so much sir.
Honestly I rarely comment on videos but I had to commend you on such a STRAIGHTFORWARD AND UNDERSTANDABLE explanation that combined visual and audio teaching tactics in the best way possible! Yes!
My chemistry professor said that boiling occurs when the average KE of the molecules is enough to overcome the intermolecular forces in the liquid, and thus the liquid can enter the gaseous state and boils. How do you reconcile this explanation with the atmospheric pressure/vapor pressure explanation of how boiling works? Thanks
Good observation. As with most phenomenon in chemistry there is along going on! Your professor is correct and the intermolecular forces help explain why different substances have different boiling points. In this video my focus was on the relationship between vapor pressure and atmospheric pressure, something students really struggle with. A more complete model would take into account intermolecular forces as well. Perhaps that would be a good video to do as a followup. Thanks, Dr. B
Oh god. I just understood the meaning of vapor pressure in a reductionist point of view. Atomic model gives the best way for understanding physics. Please makes more videos on basic concepts on thermodynamics! For sure you'll help a lot. I just subscribed!
Well done, especially the graphics. One little quibble: I don't quite get what you are saying when you describe the water vapor molecules entering the air above the liquid "effectively" reduces the air pressure. Don't the water molecules that are vapor become part of the "air pressure?" Each component of the air, O2 N2, and H2O, etc all have their individual vapor pressures, which make up the total air pressure pushing down on the liquid. Since the air above the liquid is not confined and can spread out as the water vapor takes the place of other air components the total air pressure including the water vapor remains the same and is not reduced.
I was reading a textbook about the vapor-liquid equilibrium and I came across this line " When the partial pressure of component in a gas mixture exceeds the vapor pressure of that component, condensation will occur" 1.I dont really get what this sentence is talking about, isn't the partial pressure of a component the same as its vapor pressure ? 2. And why the partial pressure exceed the vapor pressure of the component, condensation will occur ? Can you give me a clear explanation and a clear visualization please?
This video cleared my doubt about this topic that is if vapour pressure = Atmospheric pressure then how the increase in vapour pressure reduce the boiling point. Thanks
All good, but come water molecule can escape the liquid when vapor pressure equals atmospheric pressure. In theory the vapor pressure should exceed the atm pressure and then the water molecules could pass /push through the air. Also textbook says that vapor pressure is the pressure exerted by the water molecules on the liquid surface when they are hit by the air molecules. You said that vapor pressure equals the pressure exerted by the water molecules(escaping ones) against the air molecules?
All good questions! I suppose you could say the vapor pressure must exceed but it's a very fine line. But typically textbooks say that when they are equal boiling can begin. Note that not all molecules are moving at the same speed (water or air). There is a distribution of speeds. --- Dr. B
I'm a little confused,does that mean that vapor pressure is the pressure exerted both on the liquid and on the air molecules? And how does it happen that water expands,forms a bubble of gas & bubbles to the top? Does water still look like a H20 molecule but is only different because it is no longer bonded to other H20 molecules & has more energy? How does this bubble form,what's in this bubble?
to be honest you probally turning it into o and h then back into h20 so really boiling is doing both its just that oxygen will suck back most of the hydrogen right? so happens fast as fast
But if the atmosphere had a pressure of say 1 atm, and it was replaced by water vapor that also has a pressure of 1 atm, wouldn't the water vapor be exerting the same amount of downward pressure on the liquid water as the atmosphere had been originally? This video makes it seem like the atmosphere pushes down but the water vapor doesn't. Don't they both push in all directions? I think the pressure pushing down on the liquid water is the same no matter what, it's just when the water is at it's boiling point the water molecules have enough energy to push up against that pressure, resulting in the 1atm air being displaced by 1atm water vapor. I think vapor pressure being equal to atmospheric pressure is a result of boiling, not the cause of boiling.
why atmospheric pressure makes water difficult to spread out and form a bubble? when you give a pressure to (let say) marbles, they spread out instead, no?
Think of it as the pressure being created by air molecules above and around. If you push down on marbles from all sides they won't spread out. Atom pressure pushes from all sides. Like this: ruclips.net/video/Rbudgaiu3K4/видео.html
I have a little bit question. I am still confused with concept of hydrosatic pressure and atmospheric pressure. In the video, you explain the water will boiling when the pressure of water same with atmospheric pressure so water will began to boiling, but what is the relation between hydrostatic pressure due to pressure is under surface water higher than atmospheric (P0 + rho.g.h). How the concept of boiling when the pressure under water is higher than atmospheric pressure? Please, can you explain it, thank you
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
When the water molecules leave the liquid the collide with the air molecules creating an upward pressure. Then reduces the pressure (the air molecules striking the water surface). --- Dr. B
Sir i had a question how can the boiling point of a liquid in a closed chamber be raised by increasing the pressure and reduced by decreasing the pressure?
It depends on the size of the container and the temperature. But as long as there is enough water (it doesn't all evaporate) then the amount of water doesn't affect the vapor pressure. Take a look at this discussion: www.quora.com/What-are-the-factors-affecting-vapour-pressure --- Dr. B
![Megan Thee Stallion - Neva Play (feat. RM) [Official Video]](http://i.ytimg.com/vi/TpYTyAaTRts/mqdefault.jpg)
This explanation was so good it brought tears to my eyes. Thank you!
Thanks for this comment, I really worked hard on this particular video! --- Dr.B
Seriously !!!
What's the vapor pressure of tears hah!?
@@wbreslyn literally amazing, the visuals the explanation. thank you!
@@Jasmine-ez5td Some former students helped with the animations, that's why they are so good!
You explained it the way I wanted it to be explained. Makes a lot of sense now. Thanks!
I'm 2 weeks away from taking the MCAT and I've read about this concept probably 20 times now, and it has finally clicked. Thank you kind sir!!!
Best of luck with the MCAT!
after searching through a couple of videos on vapour pressure i can say that by far this video has the best explanation.
thank you
Thanks, that is great to hear!
Wow, you're a true hero. THANK you for giving a STRAIGHT FORWARD explanation. You should write textbooks!!
Thanks, this video took quite a bit of thinking to create ... Dr. B
I've watched about 10 videos about this subject but still didn't quite get it. After this one it's totally clear! Thank you, excellent work
Just adding to the major consensus in the comments. Best explanation I've ever heard for this. You're a blessing
this is the best way to explain vapour pressure.. the vaccum jar definition doesn't make much sense when defining vapour pressure.
This was just what I needed! I finally understand this concept now. Great visuals and explanations. Thank you!
That's excellent! This is a tough concept. --- Dr. B
This comment has made a century list . And I have to say you have made life easy to understand fluid properties in a more precise and lucid manner.
Thank you so much sir.
Thanks, this is probably one of my best videos and one I try to emulate. --- Dr. B
Great job with conceptualization and visualization. Exactly what I needed to see. Thank you.
Thanks, glad I could help with vapor pressure! --- Dr. B
This IS THE BEST VDO ON VAPOR PRESSURE I have ever seen...
You have cleared many of my concepts...
Thanks a lot...
Thanks! This is what I consider my best video out of all my videos. ---- Dr. B
99% more clear than what's taught in my school
Thanks! I only have 1% to do until I'm done... --- Dr. B
Wayne Breslyn hehe :D
Had no idea what vapor pressure is before this video. Your explanation helped me fully understand the concept thank youuu
Honestly I rarely comment on videos but I had to commend you on such a STRAIGHTFORWARD AND UNDERSTANDABLE explanation that combined visual and audio teaching tactics in the best way possible! Yes!
Thanks for the kind words. This is the video I try to emulate whenever I'm making new videos! --- Dr. B
I have learned chemistry for 4 years and never actually understand the vapor pressure. It makes so much sense now. Thank you so much
To be honest, I understood it much deeper myself after making the video!
This is an A-rate explanation for this concept! Most other sources skip on the meat and potatoes of the theory behind this phenomenon, job well done!
Thanks, this one required quite a bit of thought to make! --- Dr. B
Very concise and exactly what I needed, thank you!
Excellent! I aim to be concise.
- Dr. B
This is the best explanation I have ever found. This is crazyyy.
After 3 months of MCAT studying this 2 min video finally cleared up this concept for me, thank you.
Happy to help and all the best on the MCATs!
Add to the others in saying this is a wonderfully clear explanation with very helpful animations
thank u very much ..i really gone mad by this stuff....u made it simple..
i really wanted this kind of explanation ,tnq u so much
Glad I could help! Atmospheric pressure and vapor pressure are tough concepts! --- Dr. B
I'm feeling pressured to understand this.
Hopefully your brain doesn't boil over...
--- Dr. B
It finally Clicked! Thank you so much! I spent like a year trying to understand this, it was always in the back of my head.
Thank you so much!!!!......I have literally wasted half an hour for this small doubt untill I find this video...
Happy to help!
Excellent explanation. Easily understandable wording, complimented by well-placed visuals.
Thanks, this is one of my favorite videos! --- Dr. B
Thank you so much for making this video and many others. I learned so much from watching them. I really appreciate your work.
Glad to hear my videos are helping you learn chemistry! --- Dr. B
Why cant i find teachers like these guys!!!!!
We're out there!
My chemistry professor said that boiling occurs when the average KE of the molecules is enough to overcome the intermolecular forces in the liquid, and thus the liquid can enter the gaseous state and boils. How do you reconcile this explanation with the atmospheric pressure/vapor pressure explanation of how boiling works? Thanks
Good observation. As with most phenomenon in chemistry there is along going on! Your professor is correct and the intermolecular forces help explain why different substances have different boiling points. In this video my focus was on the relationship between vapor pressure and atmospheric pressure, something students really struggle with. A more complete model would take into account intermolecular forces as well. Perhaps that would be a good video to do as a followup. Thanks, Dr. B
this is by far the best explanation ive ver received in my life
Good to hear! --- Dr. B
Oh god. I just understood the meaning of vapor pressure in a reductionist point of view. Atomic model gives the best way for understanding physics. Please makes more videos on basic concepts on thermodynamics! For sure you'll help a lot. I just subscribed!
Thanks for your comment, that's why I make these videos! --- Dr. B
damn. the explaination was so good that i fell from the chair engrossed in this vid.
Well done, especially the graphics. One little quibble: I don't quite get what you are saying when you describe the water vapor molecules entering the air above the liquid "effectively" reduces the air pressure. Don't the water molecules that are vapor become part of the "air pressure?" Each component of the air, O2 N2, and H2O, etc all have their individual vapor pressures, which make up the total air pressure pushing down on the liquid. Since the air above the liquid is not confined and can spread out as the water vapor takes the place of other air components the total air pressure including the water vapor remains the same and is not reduced.
I was reading a textbook about the vapor-liquid equilibrium and I came across this line
" When the partial pressure of component in a gas mixture exceeds the vapor pressure of that component, condensation will occur"
1.I dont really get what this sentence is talking about, isn't the partial pressure of a component the same as its vapor pressure ?
2. And why the partial pressure exceed the vapor pressure of the component, condensation will occur ? Can you give me a clear explanation and a clear visualization please?
This video cleared my doubt about this topic that is if vapour pressure = Atmospheric pressure then how the increase in vapour pressure reduce the boiling point. Thanks
Excellent! I really like this particular video myself.
Something this simple sounded so complicated at school...Thank you for this video it really helps!
Thank you! --- Dr. B
This was the explanation I was looking for. Thank you! Thank you!
Excellent, glad I could help with vapor pressure! --- Dr. B
May GOD bless you sir for you cleared my concepts ❤
Excellent explanation
. Easy to understand
Finally, I know what the vapor pressure is!
Piece of cake... This makes things a lot easier..🔥🔥🔥🔥👍👍
the video i was searching everywhere. thank u sir.
Excellent! Glad I could help with vapor pressure and boiling. --- Dr. B
All good, but come water molecule can escape the liquid when vapor pressure equals atmospheric pressure. In theory the vapor pressure should exceed the atm pressure and then the water molecules could pass /push through the air.
Also textbook says that vapor pressure is the pressure exerted by the water molecules on the liquid surface when they are hit by the air molecules. You said that vapor pressure equals the pressure exerted by the water molecules(escaping ones) against the air molecules?
My comment might give you a good laugh. I am a newbie trying to understand this concept.
All good questions! I suppose you could say the vapor pressure must exceed but it's a very fine line. But typically textbooks say that when they are equal boiling can begin.
Note that not all molecules are moving at the same speed (water or air). There is a distribution of speeds.
--- Dr. B
I'm a little confused,does that mean that vapor pressure is the pressure exerted both on the liquid and on the air molecules? And how does it happen that water expands,forms a bubble of gas & bubbles to the top? Does water still look like a H20 molecule but is only different because it is no longer bonded to other H20 molecules & has more energy? How does this bubble form,what's in this bubble?
crystal clear explaination
Thanks!
to be honest you probally turning it into o and h then back into h20 so really boiling is doing both its just that oxygen will suck back most of the hydrogen right? so happens fast as fast
But if the atmosphere had a pressure of say 1 atm, and it was replaced by water vapor that also has a pressure of 1 atm, wouldn't the water vapor be exerting the same amount of downward pressure on the liquid water as the atmosphere had been originally? This video makes it seem like the atmosphere pushes down but the water vapor doesn't. Don't they both push in all directions? I think the pressure pushing down on the liquid water is the same no matter what, it's just when the water is at it's boiling point the water molecules have enough energy to push up against that pressure, resulting in the 1atm air being displaced by 1atm water vapor. I think vapor pressure being equal to atmospheric pressure is a result of boiling, not the cause of boiling.
Sir you are genius
Very Nice explanation. Thanks for the video.
Excellent! I'm showing this to my students.
thank u so much, this really helped me with studying!
Amazing, thank you. Cleared up my confusion completely.
You're very welcome!
Man you're UNBELIEVABLE
Yeah, this is one of my favorite videos. My students helped me make it a few years back.
@@wbreslyn ❤
why atmospheric pressure makes water difficult to spread out and form a bubble? when you give a pressure to (let say) marbles, they spread out instead, no?
Think of it as the pressure being created by air molecules above and around. If you push down on marbles from all sides they won't spread out. Atom pressure pushes from all sides. Like this: ruclips.net/video/Rbudgaiu3K4/видео.html
Its incredible! Thank you very much sir ❤❤. Keep it up .❤❤❤❤❤❤
High quality channel
Clear and concise!
wonderful explanation. couldn't understand through theoretical reading
Happy to help!
Thank you so much! I've been searching around ofr a clear answer. Please write textbooks, you would save everyone;s life.
No problem, glad I could help with vapor pressure. Perhaps I should write an online chemistry textbook...
--- Dr. B
Please do!!!
Same here satish. And thank you sir also please make more videos. Thanks
No problem, I'm working on some new videos right now! --- Dr. B
@@wbreslyn Thanks for reply sir
Conceptual and true explanation
Thanks!
mindblowingggg....you just cleared alll..
Thanks! I'd say this is one of my favorite videos out of all I've created. --- Dr. B
Very accurate and concise explanation, thanks
Most welcome!
Thanks a lot! Your explanations make science fun
Glad to hear that!
great explanation. thanks now i got the concept😍😍😍
Most welcome 😊
Such a good and easy explanation. Thank you so much
Glad it was helpful!
only 2 minutes and I learned it perfectly
Explained very well 👍👍
I have a little bit question. I am still confused with concept of hydrosatic pressure and atmospheric pressure. In the video, you explain the water will boiling when the pressure of water same with atmospheric pressure so water will began to boiling, but what is the relation between hydrostatic pressure due to pressure is under surface water higher than atmospheric (P0 + rho.g.h). How the concept of boiling when the pressure under water is higher than atmospheric pressure? Please, can you explain it, thank you
The explanation is very good.
Love from India
Intuitive and equally beautiful.
Thanks a lot.
Thanks, I'd rate this as one of my best videos... --- Dr. B
How can vapour pressure be equal to atm ?because vapour pressure is measured in close tank?
keep going waiting for more videos
very good explanation ,straight to the point :) thank u
You're welcome!
this explained it very well, thank u!
Amazing work!
me, four years later :"great explanation man"
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
Best teacher
Thanks A Lot Short and Sweet in point ....!!!! Thank you....
nice concise explanation, many thanks
You're welcome! --- Dr. B
Thanks a ton. Cleared all my doubts.
Excellent! --- Dr. B
Nice video
I have ever seen.
Amazing!
Very easy and nice explanation thank you #makemescientific
You are most welcome! --- Dr. B
Thanks alot ,Amazing explanation.
It is really helpful to me
@0.43 this reduces amount of pressure felt by water means water pressure reduced??& 1.12 effectively reduce some of the pressure means???
When the water molecules leave the liquid the collide with the air molecules creating an upward pressure. Then reduces the pressure (the air molecules striking the water surface). --- Dr. B
You the best
Dr Nitesh
Thanks! --- Dr. B
Thank you so much sir. You explained it very clearly.
No problem! --- Dr. B
Thanks 4 good explanation
U r amazing sir
Thnku so much🙏🥰
Great explanation Thanks
Glad I could help with vapor pressure and boiling! --- Dr. B
thank you for your explanation
thank you so much Masta Wayne
No problem, glad I could help with vapor pressure! --- Dr. B
Thank you so much, you explained it so well =)
Sir i had a question
how can the boiling point of a liquid in a closed chamber be raised by increasing the pressure and reduced by decreasing the pressure?
Great Explanation
Glad it was helpful!
may I know if I use a small amount of water in a container will it have high vapor pressure in the container?
It depends on the size of the container and the temperature. But as long as there is enough water (it doesn't all evaporate) then the amount of water doesn't affect the vapor pressure.
Take a look at this discussion:
www.quora.com/What-are-the-factors-affecting-vapour-pressure
--- Dr. B