👉 In physics and quantum mechanics, a quittance is a unit of energy that describes the amount of energy transferred between two particles in a system. It is often used to measure the efficiency of a process or system. Quittances are typically measured in joules per second (J/s) or electron volts (eV). They can be calculated using the equation: Q = ∫ P dS where Q is the quittance, P is the momentum transferred between the particles, and S is
