Question

what is \absolute zero\?
the temperature at which water freezes
the temperature at which all particle motion in a substance stops

Explanation:

Absolute zero is a fundamental concept in physics. It is the lowest possible temperature where, in theory, all particle motion (vibrational, translational, rotational) in a substance ceases. The temperature at which water freezes is \(0^{\circ}C\) (or \(273.15\) K), which is not absolute zero. Absolute zero is \(0\) K (\(- 273.15^{\circ}C\)).

Answer:

the temperature at which ALL particle motion in a substance stops