You may use this calculator to do simple conversions between four popular phase points of hydrogen:

  1. liquid at boiling point (-252.87°C at 1 atm).
  2. gas at Normal Temperature and Pressure (NTP = 20°C at 1 atm).
  3. gas at standard conditions (15.6°C at 1 atm).
  4. gas at standard conditions (0°C at 1 atm).



This calculator was derived from a table of specific points using the NIST Equation of State. Conversions for each point are documented in the Conversion Factors table in the Hydrogen Data Book.