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Metric Perm
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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 metric perm (not an SI unit) is defined as 1 gram of water vapor per day, per square metre, per millimeter of mercury.
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0.0000000000868127
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8.68127E-11
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https://en.wikipedia.org/wiki/Perm_(unit)
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perm{Metric}