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Old 04-12-2015
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Default Heat transfer mechanisms

Can anyone explain heat transfer mechanisms i.e conduction, convection, radiation, evaporation.
These are hot topics for USMLE these days.
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Old 04-12-2015
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I dont know exactly where this topics are needed?

But since you asked look at this image,



Heat can travel from one place to another in three ways: Conduction, Convection and Radiation. Both conduction and convection require matter to transfer heat.

Conduction is the transfer of heat between substances that are in direct contact with each other.

Thermal energy is transferred from hot places to cold places by convection by movement of gas/liquid.

Radiation is a method of heat transfer that does not rely upon any contact between the heat source and the heated object as is the case with conduction and convection.

Evaporation is a type of vaporization of a liquid that occurs from the surface of a liquid into a gaseous phase. (Not going into much details that is)


Exactly why do you need this?
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Old 04-12-2015
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Quote:
Originally Posted by CleverFOX View Post
I dont know exactly where this topics are needed?

But since you asked look at this image,



Heat can travel from one place to another in three ways: Conduction, Convection and Radiation. Both conduction and convection require matter to transfer heat.

Conduction is the transfer of heat between substances that are in direct contact with each other.

Thermal energy is transferred from hot places to cold places by convection by movement of gas/liquid.

Radiation is a method of heat transfer that does not rely upon any contact between the heat source and the heated object as is the case with conduction and convection.

Evaporation is a type of vaporization of a liquid that occurs from the surface of a liquid into a gaseous phase. (Not going into much details that is)


Exactly why do you need this?
These questions are coming in USMLE step 1 these days.

Like for e.g " a lady in desert with ample supply of water will lose heat by which mechanism" and options were conduction, convection, radiation, evaporation.

Please someone discuss these topics clearly cuz they are high yield these days.
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Old 04-12-2015
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Default Check out this link:

http://www.usmleforum.com/files/forum/2014/1/782724.php

Alot of my friends got questions from this topic too.
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