# Gibbs Free Energy

- Gibbs Free Energy in Materials - Calculate the Gibbs free energy to determine the spontaneity of a reaction based on enthalpy, entropy, and temperature. ΔG = ΔH - TΔS.
- Gibbs-Helmholtz Equation - The Gibbs-Helmholtz Equation relates the Gibbs free energy change to the enthalpy and entropy changes of a reaction at a constant temperature. Learn how to use this equation.