International Temperature Scale of 1990
Defining points
The table below lists the defining fixed points of ITS-90. The triple point of water is frequently approximated by using the melting point of water at standard conditions for temperature and pressure.

International Temperature Scale of 1990

Section Title: Defining points
Table Section Text: The table below lists the defining fixed points of ITS-90. The triple point of water is frequently approximated by using the melting point of water at standard conditions for temperature and pressure.

Substance and its state	Defining point (range)

K	°C	°R	°F

Triple point of hydrogen	13.8033	−259.3467	24.8459	−434.8241

Triple point of neon	24.5561	−248.5939	44.2010	−415.4690

Triple point of oxygen	54.3584	−218.7916	97.8451	−361.8249

Triple point of argon	83.8058	−189.3442	150.8504	−308.8196

Triple point of mercury	234.3156	−38.8344	421.7681	−37.9019

Triple point of water	273.16	0.01	491.69	32.02

Melting point of gallium	302.9146	29.7646	545.2463	85.5763

Freezing point of indium	429.7485	156.5985	773.5473	313.8773

Freezing point of tin	505.078	231.928	909.140	449.470

Freezing point of zinc	692.677	419.527	1,246.819	787.149

Freezing point of aluminium	933.473	660.323	1,680.251	1,220.581

Freezing point of silver	1,234.93	961.78	2,222.87	1,763.20

Freezing point of gold	1,337.33	1,064.18	2,407.19	1,947.52

Freezing point of copper	1,357.77	1,084.62	2,443.99	1,984.32

Sentence(s)

The triple point of hydrogen's defining point is −259.3467 °C, and the freezing point of aluminium's defining point is 660.323 °C.

final_sentence: The triple point of hydrogen's defining point is −259.3467 °C, and the freezing point of aluminium's defining point is 660.323 °C.