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    unit:PERM_US
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    http://qudt.org/vocab/unit/PERM_US

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    lang:en
    U.S. Perm
    lang:en
    A perm is a unit of permeance or "water vapor transmission" given a certain differential in partial pressures on either side of a material or membrane. The U.S. perm is defined as 1 grain of water vapor per hour, per square foot, per inch of mercury.
    lang:""
    0.0000000000572135
    lang:""
    https://en.wikipedia.org/wiki/Perm_(unit)