Engineering Science

Chapter 15 Thermal cycles

15.1 Entropy

15.1.1 Introduction

You have seen from section 14.1.2, when we were discussing reversible displacement work, how the incremental work done was given by dW_rev = pdV and that the total work done during the process, between the two states, was given by Suppose now that a system undergoes the same reversible process from state 1 to state 2, and that during an infinitesimal (incremental) part of the process an amount of heat dQ_rev is transferred to or from the system, at temperature T; then a property, the