Absolute zero

Absolute zero is the point at which no further heat can be removed from an object. Commonly used temperature scales, such as Celsius and Fahrenheit, are based around every-day experience and thus have zero points vastly above this theoretical lowest possible temperature. Absolute zero corresponds to −273.15 °C on the Celsius temperature scale and to −459.67 °F on the Fahrenheit scale. It is expressed as O ° in specialist scales such as the Kelvin. Achieving absolute zero is generally regarded as an impossibility under real world conditions.