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Distinguishing heat from temperature; scales and the triple point.
Two systems in thermal equilibrium with a third are in equilibrium with each other.
Energy conservation: heat in equals internal-energy change plus work done.
Constant-temperature gas process; PV = const.
No heat exchange; PV^γ = const along the path.
Specific heats at constant P vs V; the Mayer relation.
Heat flows spontaneously only from hot to cold (Kelvin–Planck / Clausius).
Maximum possible efficiency of a reversible heat engine.
Entropy as a state function; never decreases in an isolated system.
Engine vs refrigerator vs heat pump and their performance coefficients.