Thermodynamics

The first law of thermodynamics suggests that energy can be transferred from one system to another in many forms. Also, it can not be created or destroyed. Thus, the total amount of energy available in the Universe is constant.

The second law of thermodynamics also knows as the Law of Increased Entropy. Entropy is the measure of the randomness or disorder of a system. A more random or disordered system will have a higher entropy. Heat is a random form of energy, so adding heat energy to a system will increase its entropy. The second law states that nay process will generate some waste heat energy. This heat energy is random and increases the entropy ( or disorder) of a system.

The energy from the sun allows living organisms on earth to temporarily decrease entropy, but organized systems require an overall input of energy (provided by the sun) otherwise will break down. The second law also says that closed systems become more disorganized over time. Often this is expressed by the saying "entropy tends to increase".

The third law of thermodynamics states that if all the thermal motion of molecules (kinetic energy)could be removed, a state called absolute zeor would occur. Absolute zero results in a temperature of 0 Kelvins or -273.15° Celsius.