Permeability / perm (0 °C) → ng/(m²·s·Pa)
Convert US perms at 0 Celsius to Nanograms per square meter second pascal
Convert water-vapor permeance, the mass transmission rate per area and pressure difference. Convert US perms at 0 Celsius (perm (0 °C)) to Nanograms per square meter second pascal (ng/(m²·s·Pa)). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Nanograms per square meter second pascal to US perms at 0 Celsius →
How to convert US perms at 0 Celsius to nanograms per square meter second pascal
This family uses vapor permeance, kg/(m²·s·Pa). The US perm factor is the conventional value at 0 °C, rounded per NIST. Material permeability requires thickness; perm-inch and porous-medium permeability in darcy or m² are excluded.
Use x for the value in perm (0 °C), b for the intermediate value in kg/(m²·s·Pa), and y for the result in ng/(m²·s·Pa).
ng/(m²·s·Pa) = perm (0 °C) × 5.72135e-11 ÷ 1e-12
Worked examples
10 perm (0 °C) ≈ 572.135 ng/(m²·s·Pa)
Step 1: (10 × 5.72135e-11) ≈ 5.72135e-10 kg/(m²·s·Pa).
Step 2: 5.72135e-10 ÷ 1e-12 ≈ 572.135 ng/(m²·s·Pa).20 perm (0 °C) ≈ 1144.27 ng/(m²·s·Pa)
Step 1: (20 × 5.72135e-11) ≈ 1.14427e-9 kg/(m²·s·Pa).
Step 2: 1.14427e-9 ÷ 1e-12 ≈ 1144.27 ng/(m²·s·Pa).
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About US perms at 0 Celsius
US perms at 0 Celsius (perm (0 °C)) measures permeability under the conventions above. The base value in kg/(m²·s·Pa) is (x × 5.72135e-11), where x is the numerical value in perm (0 °C). Factors shown here are rounded for display; calculations use the stored factor.
About Nanograms per square meter second pascal
Nanograms per square meter second pascal (ng/(m²·s·Pa)) measures permeability under the conventions above. The base value in kg/(m²·s·Pa) is (x × 1e-12), where x is the numerical value in ng/(m²·s·Pa). Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
US perms at 0 Celsius to nanograms per square meter second pascal reference table
| US perms at 0 Celsius (perm (0 °C)) | Nanograms per square meter second pascal (ng/(m²·s·Pa)) |
|---|---|
| 1 | 57.2135 |
| 5 | 286.0675 |
| 10 | 572.135 |
| 25 | 1430.3375 |
| 50 | 2860.675 |
| 100 | 5721.35 |
| 1000 | 57213.5 |
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