Definitions
- US perm
- The US perm is defined as 1 grain of water vapor per hour, per square foot, per inch of mercury.
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1 US perm = 0.659045 metric perms ≈ 57.2135 ng·s−1·m−2·Pa−1
- 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.
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1 metric perm = 1.51735 US perms ≈ 86.8127 ng·s−1·m−2·Pa−1
- Equivalent SI unit
- The equivalent SI measure is the nanogram per second per square meter per pascal.
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1 ng·s−1·m−2·Pa−1 ≈ 0.0174784 US perms ≈ 0.0115191 metric perms
The base normal SI unit for permeance is the kilogram per second per square meter per pascal.
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1 kg·s−1·m−2·Pa−1 ≈ 1.74784x10+10 US perms ≈ 1.15191x10+10 metric perms
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