|MadSci Network: Other|
I was reading an answer posted by Mr. Donald E Duggan (ID: 988153260.Ch ). I was confused with regard to a small aspect of his answer. "The only one of these things which is truly massless is heat, Light has a very small amount of mass according to the theory of relativity, albeit immeasureable, it is still implied." Is not light and heat (infered radiation) just different frequencies of the same kind of energy (EM vibrations)? How can heat be massless and light have mass? Additionally how can light (with some mass) travel at light speed? I have read numerous references that cite the massless nature of photons is what allows and even necessitates that light travel at light speed? Perhaps the Mr. Duggan is referring to the mass of photons via acceleration? Perhaps he ment heat as the molecular motion of a system? If so then what is the difference between the definitions of heat (infered radiation) and the other (molecular motion of a system? Which concept is more valid? I'm very confused. Help.
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