This document provides an overview of the laws of thermodynamics: - The first law states that energy is conserved and the change in internal energy of a system equals heat added minus work done. Key processes like adiabatic, isothermal, isobaric, and isochoric are also introduced. - The second law introduces the concept of entropy and states that heat cannot spontaneously flow from a cooler to a warmer body. It describes irreversible processes and defines the efficiency of heat engines. - The third law states that absolute zero cannot be reached with a finite number of steps. This established the Kelvin temperature scale. - The zeroth law establishes that if two bodies are in thermal