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# Thermodynamics ## Zeroth Law of Thermodynamics If objects A and B are separately in thermal equilibrium with a third object C, then A and B are in thermal equilibrium with each other. **In simple words:** If $T_A = T_C$ and $T_B = T_C$, then $T_A = T_B$ ## First Law of Thermodynamics The chang...

# Thermodynamics ## Zeroth Law of Thermodynamics If objects A and B are separately in thermal equilibrium with a third object C, then A and B are in thermal equilibrium with each other. **In simple words:** If $T_A = T_C$ and $T_B = T_C$, then $T_A = T_B$ ## First Law of Thermodynamics The change in internal energy of a system equals the net heat transfer *into* the system *minus* the net work done *by* the system. $\Delta U = Q - W$ ## Second Law of Thermodynamics The entropy of an isolated system never decreases. The entropy of an isolated system either stays constant (reversible process) or increases (irreversible process). $\Delta S \ge 0$ ## Third Law of Thermodynamics As temperature approaches absolute zero, the entropy of a system approaches a minimum or zero value. $T \to 0$, $S \to S_{min}$ or $0$