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Jan28-08, 09:16 AM
PF Gold
P: 707
We don't really see either, but rather the effects of them. What is called light, is the effect of a quantity of electromagnetic energy (photon).
Heat is a measure of energy content, that can be felt, or observed. As an example ( a section of steel is going to be cut, or tempered, with the addition of heat it goes thru visible changes, dull red- cherry red- orange- yellow- white, these colors are very dependable indicators of the temperature of the steel being heated) we see the "effect" of heat.