Third Law of Thermodynamics
The Third Law of Thermodynamics states that as the temperature of a system approaches absolute zero (0 Kelvin), the entropy, or disorder, of a perfect crystal approaches zero. This means that at absolute zero, a perfect crystal would have a completely ordered state with no randomness in its structure.
In practical terms, reaching absolute zero is impossible, but the Third Law helps scientists understand the behavior of materials at very low temperatures. It also provides a reference point for calculating the entropy of substances, which is important in fields like chemistry and physics.