👉 Dissipation is a concept in thermodynamics that refers to the amount of heat energy that a substance loses due to thermal agitation. It can be thought of as the rate at which heat energy is lost from an object through chemical reactions or other forms of energy transfer. The term "dissipation" typically implies a loss of heat energy, but it can also refer to a decrease in the overall temperature of an object. In thermodynamics and quantum mechanics, dissipation is often associated with systems that