UNI101Y1 Chapter Notes - Chapter 3: Wind Chill, Transpiration, Vehicle Emissions Control
16 Feb 2013
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Document Summary
The temperature of a surface reflects its heat content. Each object and orgnm on earth continually exchanges heat with its surroundings. Heat is conducted from warmer to cooler substances (i. e. if envmt is cooler than orgnm, the orgnm loses heat to it and cools down) Rraaddiiaattiioonn is the emission of electromagnetic nrg by a warm surface, which may then be absorbed by any cooler surface. Sources of radiation: sun, sky (scattered light), landscape (which radiates heat it has absorbed from the sun) lizards basking on rocks gain heat directly by radiation from the sun. Rate of nrg loss by radiation depends on temp. of radiating surface. Radiation increases w/ the 4th power of absolute temp. (k; absolute zero is 0k, which equals to -273 c: ex. an orgnm with skin temp 37 c (310k) radiates heat 30% faster than one with. At night, warmed objects radiate their stored heat to colder parts of the envmt.
