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Permeability (vapour) converter
How readily water vapour passes through a material. 5 units, converted from one table of exact factors.
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1 kilogram/pascal·second·square meter in every other permeability (vapour) unit
Computed by the same engine that runs the converter above, so these can never drift apart from it.
| From | Equals | Unit |
|---|---|---|
| 1 kilogram/pascal·second·square meter | 17,478,392,340 | permeability (0°C) (perm (0°C)) |
| 1 kilogram/pascal·second·square meter | 17,405,682,960 | permeability (23°C) (perm (23°C)) |
| 1 kilogram/pascal·second·square meter | 688,127,055,800 | perm inch (0°C) (perm·in (0°C)) |
| 1 kilogram/pascal·second·square meter | 685,264,752,000 | perm inch (23°C) (perm·in (23°C)) |
What each unit actually is
Most converters give you a number and stop. Where a figure is exact by definition we say so, and where it is an average or shifts with conditions we say that too — that is usually the thing you needed to know.
| Unit | Symbol | What it actually is |
|---|---|---|
| kilogram/pascal·second·square meter | kg/(Pa·s·m²) | SI. |
| permeability (0°C) | perm (0°C) | The US building unit. It is temperature-specific — the 0°C and 23°C perms are different sizes. |
| permeability (23°C) | perm (23°C) | |
| perm inch (0°C) | perm·in (0°C) | |
| perm inch (23°C) | perm·in (23°C) |
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