👉 Stagnation, in the context of physics and thermodynamics, refers to a state of equilibrium where there is no net change in the internal energy or mass of an object. This condition is often described as "stagnant" or "constant." In thermodynamics, stagnation is particularly important because it allows for the calculation of many fundamental aspects of entropy, such as the entropy of a system's environment and the entropy production rate of a system. Stagnation occurs when the internal energy