Flexi Says: Absolute zero, or 0 K (−273.15 degrees Celsius, -459.67 Fahrenheit) marks the temperature where a system reaches its lowest possible energy, or thermal motion. Theoretically, most atomic motion would cease at this temperature. However, it may not be possible to actually reach this temperature due to the dramatic increase in work needed to continue cooling matter as you get closer to absolute zero. Even if it were reached, atoms and molecules would retain some amount of inherent quantum mechanical motion, as the quantum particles that make up atoms (e.g., electrons and quarks) have wave properties and are thus defined in some ways by motion.
