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On 08/23/2010 12:49 PM, James McLean wrote:OK, chemistry gets me thinking outside my box. Thanks.
My question:
>>> Aside from phase transitions, are there other isothermal processes
that result in an internal energy change?<<<
a) Chemical reactions routinely violate that both ways:
dT=0 dU<>0
dT<>0 dU=0
b) Find a slightly "leaky" capacitor (or just attach a low-conductanceShould this be "leave it contact with a thermal reservoir"? I get that thermal insulation means dQ=dW=0, but that field energy has to go somewhere.
shunt). Charge it and leave it a thermally isolated container.
c) A high-Q mechanical oscillator in a box is another example.I suppose this is another play on (b). I'm not entirely sure I would call that "internal" energy. If we introduce macroscopic degrees of freedom, then we open the whole pointless can of worms about where to draw the microscopic/macroscopic line.
=====================>
Bottom line: temperature is not the same as energy. Really,
really not.