ΔS = ΔQ / T
where f(E) is the probability that a state with energy E is occupied, EF is the Fermi energy, k is the Boltzmann constant, and T is the temperature.
One of the most fundamental equations in thermodynamics is the ideal gas law, which relates the pressure, volume, and temperature of an ideal gas:
ΔS = nR ln(Vf / Vi)