Which of the following statements about absolute zero is true?

The statement that "all molecular motion ceases at absolute zero" is significant because absolute zero, defined as 0 Kelvin, represents the theoretical point at which the entropy of a perfect crystal would be zero, and ideally, all classical motions of particles would stop. This means that at absolute zero, particles are in their ground state and exhibit minimal motion. While in practical terms, due to quantum mechanical effects, it is impossible to completely eliminate all motion—such as zero-point energy—this statement captures the understanding that molecular motion is drastically reduced.

Absolute zero is a critical concept in thermodynamics and low-temperature physics, impacting how we understand the behavior of gases, solids, and other states of matter at extremely low temperatures. Other options present misunderstandings or common misconceptions related to absolute zero.