The document summarizes the main laws of thermodynamics: The First Law states that energy can neither be created nor destroyed, only changed in form. The Second Law states that heat spontaneously flows from hotter to colder bodies until they reach the same temperature. Entropy, a measure of disorder, always increases over time as energy spreads out. The Third Law establishes that entropy approaches a minimum, constant value as temperature approaches absolute zero. The Zeroth Law defines temperature as a physical property of a system, such that systems in thermal equilibrium have the same temperature.