What does the third law of thermodynamics state regarding absolute zero?

The third law of thermodynamics states that as the temperature of a system approaches absolute zero, the entropy of a perfect crystal approaches zero. This principle implies that achieving absolute zero is unattainable because it would require the complete removal of all thermal energy from a system, which cannot happen in a finite number of steps. In practical terms, as one gets closer to absolute zero, the amount of energy still present becomes increasingly difficult to eliminate, making it impossible to reach that temperature through any finite process.

The notion of entropy approaching zero at absolute zero is significant because it denotes a state of perfect order, where particle motion is minimized. This foundational concept in thermodynamics highlights the intrinsic limitations of cooling systems and the fundamental physics governing temperature and entropy.