The third law of thermodynamics is the least common of the three laws. It explains that as a temperature approaches absolute zero on the kelvin scale, the entropy of the system reaches a minimum, but not zero (S > 0).
Absolute zero is equal to zero on the kelvin temperature scale, which is -273.15°C or -459.7°F.
However, because of the second law of thermodynamics no substance or system can have a temperature of 0 K. The second law encompasses the idea that matter can’t move from a colder state to a hotter state instantly, but must go through several energy changes. So, as a sample nears absolute zero, it must pull energy from its environment and can’t reach absolute zero.
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