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At 6:22 PM -0800 1/31/2001, William Beaty wrote:
If the "internal energy" of an object is thermal photons and thermal
phonons and electron band energy and chemical bond energy and nuclear bond
energy and everything else, then as I understand it, the usual meaning of
"heat" is "thermal photon energy plus thermal phonon energy." Heat is
blackbody radiation within an object, plus the hypersonic white-noise of
thermal vibrations of the lattice. (Uh, do we need to add the energy
contained in the electrons of hot metals?) As long as chemical or nuclear
reactions or phase changes aren't adding or subtracting thermal
photons/phonons within the object, then "heat" is conserved because energy
is conserved.>
Temperature is simpler and can be defined and measured.
When I say "in some circumstances", maybe I could better say "within
limits." Inject a joule of electrical energy into a resistor, and this
resistor now contains a joule of "heat."
No. A Joule of energy has increased the temperature of the resistor
according to the heat capacity of the resistor.