Which statement best describes absolute zero?

Absolute zero is defined as the theoretical temperature at which all molecular motion ceases. It is equivalent to 0 Kelvin, which is -273.15 degrees Celsius or -459.67 degrees Fahrenheit. At this point, a substance would possess minimal thermal energy, and the atoms would be in their lowest energy state possible, effectively stopping all motion. This concept is fundamental in thermodynamics, as it represents the lower limit of temperature in the physical universe.

While the other statements refer to specific temperatures related to water, they do not pertain to absolute zero. For example, the freezing point of water occurs at 0 degrees Celsius, and the boiling point happens at 100 degrees Celsius, which are far above absolute zero. Therefore, recognizing that absolute zero represents a unique state where molecular motion completely halts is crucial in understanding thermodynamic principles.