* Usual state at room temperature and pressure: gas

* Melting point: -218.4 °C (-361.1 °F)

* Boiling point: -182.962 °C (-297.332 °F)

Hydrogen:

* Usual state at room temperature and pressure: gas

* Melting point: -259.14 °C (-434.49 °F)

* Boiling point: -252.879 °C (-423.182 °F)