Why can U be expanded in terms of T and V?

thegirl · Mar 24, 2016

when expressing dS as a function of dV and dT, dU was expanded out as you can see in the screenshot below, is there a mathematical rule which allows this? does the fact that the internal energy is expanded out change the meaning of the expression?

Chestermiller · Mar 24, 2016

How many intensive properties are required to specify the state of a single phase material of constant composition?

Jason White · Mar 25, 2016

thegirl said:

when expressing dS as a function of dV and dT, dU was expanded out as you can see in the screenshot below, is there a mathematical rule which allows this? does the fact that the internal energy is expanded out change the meaning of the expression?View attachment 97881

dU/dT(V)+dU/dV(T) is the differential of U with the coordinated (T,V)

thegirl · Mar 27, 2016

Thank you!

Why can U be expanded in terms of T and V?

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