Radiation
n radiation, heat is transferred from an object to its surroundings in the form of EM radiation, usually infrared (IR) radiation.
T is the temperature on the "absolute temperature scale"
T is measured in Kelvins.
e is called the "emissivity" and depends upon the surface; we will usually take e = 1.
is called the Stefan-Boltzman constant; = 5.67 x 10 - 8 W/m2 K4
A stove emits more heat than it absorbs --A pan, inside an oven, absorbs more heat than it emits --
Thermos Bottle
Greenhouse Effect
Convection Evaporation Return to ToC, Temperature (c) 2005, Doug Davis; all rights reserved