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If light is matter, wouldn't that mean that dark rooms contain less matter than light rooms?
Answer 1:

Light is not matter. Light is energy. There is not appreciably less energy in a darkened room than in a lit room. Most of the free energy in a room is in the form of heat, regardless.


Answer 2:

Light isn't actually matter, it is energy. Light is radiation, or energy, but is not matter itself, because it actually has no mass. So no, dark rooms do not contain less matter than light rooms, just less energy.



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