Chapter02c - Solar Energy and Energy Balance in the...

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Unformatted text preview: Solar Energy and Energy Balance in the Atmosphere Mid-chapter summary • The temperature of a substance is a measure of the average kinetic energy (average speed) of its atoms and molecules. • Evaporation (the transformation of liquid into vapor) is a cooling process that can cool the air, whereas condensation (the transformation of vapor into liquid) is a warming process that can warm the air. • Heat is (thermal) energy in the process of being transferred from one object to another because of the temperature difference between them. • In conduction, which is the transfer of heat by molecule-to-molecule contact, heat always flows from warmer to colder regions. • Air is poor conductor of heat. • Convection is an important mechanism of heat transfer, as it represents the vertical movement of warmer air upward and cooler air downward. • All objects with a temperature above absolute zero emit radiation. • The higher an object’s temperature, the greater the amount of radiation, and the shorter the wavelength of maximum emission. Methods for heat transfer in the atmosphere • Thermal conduction ♦ It requires: physical contact, temperature difference ♦ The energy flow is from a body with high T to a body with low T....
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This note was uploaded on 01/26/2012 for the course MET 1010 taught by Professor Matchev during the Spring '08 term at University of Florida.

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Chapter02c - Solar Energy and Energy Balance in the...

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