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U.S. 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 U.S. perm is defined as 1 grain of water vapor per hour, per square foot, per inch of mercury.
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0.0000000000572135
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5.72135E-11
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https://en.wikipedia.org/wiki/Perm_(unit)
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perm{US}