Vapor Pressure and Boiling

The molecules leaving a liquid through evaporation create an upward pressure as they collide with air molecules. This upward push is called the vapor pressure.

Different substances have different vapor pressures and therefore different boiling points. This is due to differing intermolecular forces between molecules.

The vapor pressure of a liquid lowers the amount of pressure exerted on the liquid by the atmosphere. As a result, liquids with high vapor pressures have lower boiling points.

Vapor pressure can be increased by heating a liquid and causing more molecules to enter the atmosphere. At the point where the vapor pressure is equal to the atmospheric pressure boiling will begin. In effect, without any external pressure the liquid molecules will be able to spread out and change from a liquid to a gaseous phase. The gas, as bubbles in the liquid, will rise to the surface and be released into the atmosphere.

[ixramuffin]

This explanation was so good it brought tears to my eyes. Thank you!

[SatishNatarajan]

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[CreRay]

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

[ikennafranklinokoro]

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[johnnyBrwn]

Wow, you're a true hero. THANK you for giving a STRAIGHT FORWARD explanation. You should write textbooks!!

[Yash]

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[mariesiren]

This was just what I needed! I finally understand this concept now. Great visuals and explanations. Thank you!

[zainahmed]

this is the best way to explain vapour pressure.. the vaccum jar definition doesn't make much sense when defining vapour pressure.

[wassunoor]

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[smitaaay]

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[crazyplatypus]

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[hiud]

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[ayuschmannov]

This IS THE BEST VDO ON VAPOR PRESSURE I have ever seen...
You have cleared many of my concepts...
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[ellesiegmund]

Great job with conceptualization and visualization. Exactly what I needed to see. Thank you.

[ShivamSharma-zdlw]

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!

[krishnannarayanan]

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.

[StuartFarrimond]

Add to the others in saying this is a wonderfully clear explanation with very helpful animations

[saraibrahim]

Had no idea what vapor pressure is before this video. Your explanation helped me fully understand the concept thank youuu

[lananhnguyen]

I have learned chemistry for 4 years and never actually understand the vapor pressure. It makes so much sense now. Thank you so much

[ferncat]

Very concise and exactly what I needed, thank you!