International Temperature Scales

This scale is based on a number of fixed temperature points and serves as calibration reference. All temperatures are measured at standard atmospheric pressure of 760 mm mercury.

• The oxygen point: The boiling point of liquid oxygen: –182.97 °C.
• The ice point: The melting point of pure ice: 0 °C.
• The boiling point: The boiling point of pure water: 100 °C.
• The sulphur point: The boiling point of pure sulphur: 444.6 °C.
• The silver point: The melting point of silver: 961.78 °C.
• The gold point: The melting point of gold: 1064.18 °C.