History
Further information: Timeline of low-temperature technologyIn 1885 Zygmunt Florenty Wróblewski published hydrogen's critical temperature as 33 K; critical pressure, 13.3 atmospheres; and boiling point, 23 K.
Hydrogen was liquefied by James Dewar in 1898 by using regenerative cooling and his invention, the vacuum flask. The first synthesis of the stable isomer form of liquid hydrogen, parahydrogen was achieved by Paul Harteck and Karl Friedrich Bonhoeffer in 1929.
Read more about this topic: Liquid Hydrogen
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