Task: Text Categorization
Input (English): When referring to electrons, it is approximately equal to the Fermi energy when the temperature is substantially less than the characteristic temperature. When equated with the electrical potential, it can be used to derive the Nernst equation and it is defined as the partial derivative of the free energy of a system with respect to the amount of a substance. For a substance in phase equilibrium the gas and liquid phase values for this quantity are equal. Sometimes known as the partial molar Gibbs Energy, for 10 points, name this "energy" that explains diffusion as particles flow from higher concentrations to lower concentrations.
Output (English): Science