Permeability / ng/(m²·s·Pa) → perm (0 °C)
Convert Nanograms per square meter second pascal to US perms at 0 Celsius
Convert water-vapor permeance, the mass transmission rate per area and pressure difference. Convert Nanograms per square meter second pascal (ng/(m²·s·Pa)) to US perms at 0 Celsius (perm (0 °C)). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: US perms at 0 Celsius to Nanograms per square meter second pascal →
How to convert nanograms per square meter second pascal to US perms at 0 Celsius
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 ng/(m²·s·Pa), b for the intermediate value in kg/(m²·s·Pa), and y for the result in perm (0 °C).
perm (0 °C) = ng/(m²·s·Pa) × 1e-12 ÷ 5.72135e-11
Worked examples
10 ng/(m²·s·Pa) ≈ 0.174783923375 perm (0 °C)
Step 1: (10 × 1e-12) ≈ 1e-11 kg/(m²·s·Pa).
Step 2: 1e-11 ÷ 5.72135e-11 ≈ 0.174783923375 perm (0 °C).20 ng/(m²·s·Pa) ≈ 0.349567846749 perm (0 °C)
Step 1: (20 × 1e-12) ≈ 2e-11 kg/(m²·s·Pa).
Step 2: 2e-11 ÷ 5.72135e-11 ≈ 0.349567846749 perm (0 °C).
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 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.
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.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Nanograms per square meter second pascal to US perms at 0 Celsius reference table
| Nanograms per square meter second pascal (ng/(m²·s·Pa)) | US perms at 0 Celsius (perm (0 °C)) |
|---|---|
| 1 | 0.0174783923375 |
| 5 | 0.0873919616874 |
| 10 | 0.174783923375 |
| 25 | 0.436959808437 |
| 50 | 0.873919616874 |
| 100 | 1.74783923375 |
| 1000 | 17.4783923375 |
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