Absolute zero is the zero of thermodynamic temperature, corresponding to . For a system with a nondegenerate ground state, equilibrium entropy approaches zero as temperature approaches absolute zero. This does not mean that every quantum degree of freedom loses its zero-point energy. The entropy statement and the operational unattainability of absolute zero require their respective physical assumptions.
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Absolute zero is the theoretical lowest temperature possible, at which a system reaches its minimum internal energy. It is defined as 0 Kelvin (K), which is equivalent to -273.15 degrees Celsius (°C) or -459.67 degrees Fahrenheit (°F). At absolute zero, the motion of atoms and molecules comes to a near stop, and they occupy their lowest possible energy state.