Absolute zero

Absolute zero is theoretic temperature which according to current knowledge cannot be achieved but is possible to greatly approach. Value of absolute zero is 0K (kelvin) or -273.15 °C or -459.67 °F, lowest measured in laboratory environment was under -273°C. Absolute zero is state of solid with lowest possible internal energy.

Easy and Quick Conversion of Temperatures between Scales
(c) Jan Zaškolný 2008