What unit is heat measured in?

Heat is fundamentally measured in joules, which is the SI unit of energy. In the context of thermodynamics, joules quantify the amount of energy transferred as heat. When discussing heat in various processes—like heating a substance, performing work, or in energy exchanges—it's crucial to use the correct measurement to accurately describe the energy involved.

Newtons pertain to force, not heat. While watts measure power, or the rate at which work is done or energy is transferred, they don't quantify heat directly. Entropy, on the other hand, is a measure of disorder or randomness in a system, relating to energy dispersal rather than a direct measurement of heat itself. Understanding these distinctions underscores the importance of using joules as the measure for heat in thermodynamics and energy discussions.