Question
Wed October 12, 2011 By:
 

When a wet cloth dries, water evaporates at temperature below 100 degree ie. the boiling point of water. How water evaporates at temperature below 100 degree?

Expert Reply
Wed October 12, 2011
the wet cloth is constantly being bombarded by air molecules, some of which are at high enough velocity to knock of the water molecule off the cloth.

at higher temperature, more air molucules have such higher velocity. at lower humidity, less water molecules get back to the cloth.

also the water molecules in the cloth are not stationary but having energy. they absorb energy from the atmosphere to escape the cloth.

overall temperature is an average of all molecules but each and every molecule can be at a differant energy state.
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