Why is absolute zero the lowest possible temperature?

Answer 1

Nothing can be colder than absolute zero, which is the lowest temperature that is possible to reach. At absolute zero, the energy of each particle in a material is at its lowest possible level (also referred to as the zero point energy).

The laws of thermodynamics demonstrate that absolute zero can never be reached; to put it another way, no process can ever bring a system's temperature down to zero in a finite number of operations (≈ Guggenheim).

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Answer 2

Luna Chen

Absolute zero is the lowest possible temperature because it corresponds to the point at which particles have minimal thermal motion, approaching a state of minimum energy.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.