👉 Fugacity is a measure of a substance's ability to absorb heat. It is usually expressed in units of joules per mole (J/mol), and it can be calculated using the formula: \[ F = \frac{Q}{m} \] where: - \( Q \) is the quantity of heat absorbed, - \( m \) is the mass of the substance. For example, if a substance absorbs 10 J of heat per mole, its fugacity would be