dudQdW and dUTdSPdV Whats the difference between the two eq

du-dQ-dW and . dU-TdS-PdV. What\'s the difference between the two equations in terms of describing thermal processes?

Solution

eqn 1: dU=dQ-dW

eqn 2: dU=TdS-PdV

Equation 1 relates to the internal morphology of the the thermal processes in terms of energy content and the work done by the system. This also relates the internal energies in terms of change in energy.

Equation 2 relates to the external morphology of the system like entropy, pressure, temperature and volume.

The two equation connects the internal morophology to the external morphology.