internal energy

2009-11-06 8:06 am

U (Internal Energy) = Q (Heat) + W (work done)
IE=average KE (molecular) + PE (intermolecular)
Is there any relationship or Is it the same :
Q (Heat) = average KE (molecular) ?
W (work done) = PE (intermolecular) ?

回答 (1)

天同

2009-11-07 4:14 am

✔ 最佳答案

You probably have some misunderstanding of the euqation that you wrote: U (Internal Energy) = Q (Heat) + W (work done), the equation is wrongly written or is wrongly interpreted.

The first law of thermodynamic, generally written the form:
dQ = dU + dW
where dQ is the heat input to, or output by, a system
dU is the change of internal energy, and
dW is the work done by the system

A change of internal energy is NOT equal to the internal energy itself. Hence, the relations between Q and KE, W and PE so quoted by are physically unfounded.

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