What are the units of free energy and how are they determined in thermodynamics?

The units of free energy are typically measured in joules (J) or kilojoules (kJ). In thermodynamics, free energy is determined through calculations involving the change in enthalpy (H) and the change in entropy (S) of a system, using the equation G H - TS, where G is the change in free energy, H is the change in enthalpy, S is the change in entropy, and T is the temperature in Kelvin.