CHEM 001 Lecture Notes - Lecture 21: Thermodynamics, Intensive And Extensive Properties, Irreversible Process
13 Aug 2020
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Definition: heat cannot be changed into work in a cyclical process. Definition 2 : entropy of an isolated system will never decrease. C. definition 3 : 2nd law generally deals with irreversibility. A. assigns a zero entropy value to any pure substance (element or compound) at absolute zero and in internal equilibrium. B. entropy change = tiny change in heat per kelvin in a reversible process. Definition: two systems in thermal equilibrium with a third system are in equilibrium with each other. That is, two bodies in thermal equilibrium share a thermodynamic property, which must be a state function; its called temperature. Open: exchange both mass and energy with their surroundings. Closed: exchange energy but not mass with their surroundings. I solated/ adiabatic: do not exchange energy or mass. B. surroundings: everything other than the macroscopic body under study. State: physical condition of a system described by a specific set of thermodynamic properties.
