What does absolute zero represent in terms of molecular motion?

Absolute zero represents the theoretical temperature at which molecular motion comes to a complete halt. At this point, the kinetic energy of the molecules is minimized, and they occupy their lowest possible energy states. This concept is crucial in thermodynamics and provides a baseline for the Kelvin temperature scale, where zero Kelvin corresponds to absolute zero.

Understanding absolute zero is fundamental in physics and chemistry, as it helps explain the behavior of gases and the relationships between temperature, energy, and molecular motion. At temperatures approaching absolute zero, substances exhibit unique behaviors, including superconductivity and superfluidity, due to the reduced thermal agitation of particles.