The zeroth law of thermodynamics states that when two systems are in thermal equilibrium with a third system, they are in thermal equilibrium with each other. The first law of thermodynamics states that the total energy of a system is constant.
The second law of thermodynamics states that total entropy of an isolated system only increases over time.
The third law of thermodynamics states that the total entropy of a system approaches a constant value as the temperature of the system approaches absolute zero.
The second law of thermodynamics states that the amount of available energy in a closed system is decreasing constantly. Energy becomes unavailable for use by living things because of entropy, which is the degree of disorder or randomness of a system. The entropy of any closed system is constantly increasing. In essence, any closed system tends toward disorganization.
There are two such laws. The first law of thermodynamics states that energy can neither be created nor destroyed. This law implies that the total amount of energy in a closed system (for example, the universe) remains constant. Energy neither enters nor leaves a closed system.