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: [[Object]]s will [[Absorb (Physics)|absorb]] [[radiation]] that [[Incident Ray|incidents]] its surface. The [[colour]] and [[reflectivity]] of the [[object]] determine the amount of [[radiation]] [[Absorb (Physics)|absorbed]].
: When the rate of [[energy]] [[emission]] and the rate of [[energy]] [[Absorb (Physics)|absorption]] are equal the [[object]] will remain at a '''constant temperature'''.
: If the rate of [[emission]] is greater than the rate of [[Absorb (Physics)|absorption]] then the [[object]] will decrease in [[temperature]] until the rates are equaland it achieves '''temperature constancy'''.: If the rate of [[emission]] is less than the rate of [[Absorb (Physics)|absorption]] then the [[object]] will increase in [[temperature]] until the rates are equaland it achieves '''temperature constancy'''.