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 some of it. Thereby molecular motion is set up in the glass itself and it becomes warm, radiating heat in just the same manner as a stove radiates it.

The heat “absorbed” by a substance—that is, converted into molecular motion—in time may be stored until it is again radiated and is given out as warmth. It is conveniently called “sensible heat.” It is thus distinguished from the ether waves

After Ferrel.

Diffusion of Heat.—As a body becomes warm, the heat may diffuse itself through the mass rapidly, as in the case of metals,