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Perm (unit)
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. ==Definitions== ;US perm :The US perm is defined as 1 grain of water vapor per hour, per square foot, per inch of mercury. : ;Metric perm :The metric perm (not an SI unit) is defined as 1 gram of water vapor per day, per square meter, per millimeter of mercury. : ;Equivalent SI unit :The equivalent SI measure is the nanogram per second per square meter per pascal. : The base normal SI unit for permeance is the kilogram per second per square meter per pascal. :
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