![]() The chapter also introduces a major subsidiary thermodynamic property, the Gibbs energy, which lets us express the spontaneity of a process in terms of the properties of a system. We examine two simple processes and show how to define, measure, and use a property, the entropy, to discuss spontaneous changes quantitatively. The Second Law The purpose of this chapter is to explain the origin of the spontaneity of physical and chemical change. 3 The direction of spontaneous change 3.1 The dispersal of energy 3.2 Entropy I3.1 Impact on engineering:Īccompanying specific processes 3.4 The Third Law of
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