Basically, heat is the thing you say to describe your detection of a transfer of internal energy from an object to its surroundings. E.g., an object's atoms ar

Basically, heat is the thing you say to describe your detection of a transfer of internal energy from an object to its surroundings. E.g., an object's atoms are vibrating a lot, and you touch it, and that vibration spreads to your atoms, so you say you've noticed "heat" in that object. Or the vibrations are emitting radiation (like infrared light) to you, and the radiation begins vibrating your atoms, so you might say "heat is coming off of that object". >Heat is energy in transfer to or from a thermodynamic system, by a mechanism that involves the microscopic atomic modes of motion or the corresponding macroscopic properties. >In the kinetic theory, heat is explained in terms of the microscopic motions and interactions of constituent particles, such as electrons, atoms, and molecules.[57] The immediate meaning of the kinetic energy of the constituent particles is not as heat. It is as a component of internal energy. In microscopic terms, heat is a transfer quantity, and is described by a transport theory, not as steadily localized kinetic energy of particles. Heat transfer arises from temperature gradients or differences, through the diffuse exchange of microscopic kinetic and potential particle energy, by particle collisions and other interactions.[0] 0: https://en.wikipedia.org/wiki/Heat https://en.wikipedia.org/wiki/Heat