Third Law of Thermodynamics

The third law of thermodynamics examines systems that reach a theoretical temperature of absolute zero. It states that as a system approaches absolute zero, all processes cease and the entropy of the system approaches a minimum value. At absolute zero the entropy of a perfectly ordered pure crystaline substance is zero. Because entropy deals with a measure of disorder, this concept brings in the idea of perfect order (such as is seen in crystalline structures) existing at absolute zero.