U.s. Perm
type: Unit
description: The rate of water vapor transmission through a specific thickness of a material—i.e., the permeability divided by the thickness.
applicable system: USCS
conversion multiplier: 0.0000000000572135
conversion multiplier SN: 5.72135E-11
has dimension vector: A0E0L-1I0M0H0T1D0
has quantity kind: VapourPermeance
informative reference: https://en.wikipedia.org/wiki/Perm_(unit)
latex definition: \frac{grain}{hour \cdot ft^2 \cdot in\,Hg}
scaling of: SEC-PER-M
symbol: perm{US}
unit for quantity kind: VapourPermeance