What are the first three laws of thermodynamics?

Answer: First rule: A thermodynamically modified form of the law of conservation of energy is the first law of thermodynamics. The conservation law states that energy can be changed from one form to another but cannot be created or destroyed, meaning that the total amount of energy in an isolated system is always constant.

Second Law: When two initially isolated systems, each in thermodynamic equilibrium with itself but not necessarily with the other, are permitted to interact, they eventually reach mutual thermodynamic equilibrium. The ultimate combination has an overall entropy that is lower than or equal to the total entropies of the isolated systems at the beginning. When the two initial systems’ intense variables (temperature, pressure, etc.) are all equal, equality occurs, and the new system has the same values.

Third Law: The system must be in the ground state, which has the least thermal energy, when the temperature is zero degrees Celsius. The amount of entropy that is constant at this moment is known as the system’s residual entropy. It is noteworthy that the residual entropy of a system, with the exception of non-crystalline solids, is typically very close to zero. It only gets close to zero when the system only has one ground state. Macroscopic states with fewer microstates are thought to have a lower likelihood of occurring because each microstate is seen to have the same probability of occurring. Entropy is inversely proportional to the number of potential microstates, according to the Boltzmann principle.