A unit of mass equal to the mass of one liter of hydrogen gas at standard temperature and pressure, used in early chemistry and gas research.
From Greek 'krithos' (barley grain), used because the unit was based on the mass of a barley grain as a historical reference standard.
The crith is hilariously obscure—scientists once measured gases by how much lighter they were than hydrogen, and needed a name for that comparison unit that almost nobody uses today.
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