Supercooling and Superheating

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RyanTran2F
Posts: 44
Joined: Thu Jul 27, 2017 3:00 am

Supercooling and Superheating

Postby RyanTran2F » Mon Jan 08, 2018 9:56 pm

In section 8.12 we learned about supercooling and superheating. Can someone explain why these can happen? How does something pass the freezing point and the boiling point before freezing/boiling (respectively)? Thanks :)

Hubert Tang-1H
Posts: 44
Joined: Thu Jul 27, 2017 3:00 am

Re: Supercooling and Superheating

Postby Hubert Tang-1H » Mon Jan 08, 2018 11:38 pm

For superheating, boiling typically occurs when the vapor pressure of a liquid equals the pressure of its surroundings. Some liquids may require additional pressure to overcome surface tension.

Superheating basically occurs because of the surface tension and surrounding pressure both opposing the vapor pressure, meaning the temperature needs to be raised above the boiling point in order to have enough vapor pressure to overcome the surface tension, and cause the liquid to boil. Liquids that are above boiling point but has insufficient vapor pressure to overcome surface tension would be superheated.

Magdalena Palavecino 1A
Posts: 54
Joined: Fri Sep 29, 2017 7:04 am

Re: Supercooling and Superheating

Postby Magdalena Palavecino 1A » Wed Jan 10, 2018 7:39 pm

Do you think we will be asked to pdo problems in which the delta Hs refer to supercooling and superheating problems? Would they be solved the same way or do some specific rules apply?


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