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Perm (unit) : ウィキペディア英語版
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.
:

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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