Input interpretation
hydrogen | melting point
Result
-259.14 °C (degrees Celsius)
Unit conversions
14.01 K (kelvins)
-434.45 °F (degrees Fahrenheit)
25.22 °R (degrees Rankine)
-207.31 °Ré (degrees Réaumur)
-128.55 °Rø (degrees Rømer)
Comparisons as temperature
18.96 °C below critical point of hydrogen (32.97 K)
11.84 °C above (lower) lambda point of overbound superfluid helium (at 0.0497 atmospheres) (2.172 K)
12.3 °C above (upper) lambda point of overbound superfluid helium (at 29.8 atmospheres) (1.76 K)
Corresponding quantities
Thermodynamic energy E from E = kT: | 1.2 meV (millielectronvolts)
Blackbody energy flux Φ from Φ = σT^4: | 0.0022 W/m^2 (watts per square meter)
Thermodynamic properties
phase at STP | gas melting point | -259.14 °C (rank: 101st) boiling point | -252.87 °C (rank: 93rd) critical temperature | 32.97 K (rank: 20th) critical pressure | 1.293 MPa (rank: 20th) molar heat of fusion | 0.558 kJ/mol (rank: 88th) molar heat of vaporization | 0.452 kJ/mol (rank: 93rd) specific heat at STP | 14300 J/(kg K) (rank: 1st) adiabatic index | 7/5 (rank: 1st) (properties at standard conditions)