Description
Convert permeance to permeability for a supplied layer thickness.
Material-property conversions distinguish total quantities from values per area, mass, volume or thickness. Multiplication by a supplied density or geometry factor changes the basis only when its units and the material state agree with the original measurement.
Convert permeance to permeability for a supplied layer thickness.
When to use this tool
Use Permeance Thickness Permeability Factor when converting the stated material-property basis using compatible supplied quantities.
How to use the tool and how it works
- Enter permeance, thickness. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read permeability. Use the output convention below.
Convert permeance to permeability for a supplied layer thickness. Require permeance >= 0 and thickness > 0; permeability = permeance*thickness.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| permeance | Permeance | Required. Finite number; minimum 0. |
| thickness | Thickness | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| permeability | Permeability | Required. Finite number. |
{
"input": {
"permeance": 4,
"thickness": 0.25
},
"output": {
"permeability": 1
}
}Limitations and assumptions
- The same pressure/activity driving-potential convention and consistent length units are required; multilayer resistance is not resolved.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use verified unit definitions and state-specific material data; model interfaces, layers and measurement geometry explicitly for complete physical calculations.
References
Similar or alternative tools
- Vapor Permeability Resistance Factor
Return a homogeneous layer's vapor resistance.
- Surface Density Linear Thickness Factor Tool
Calculate surface density linear thickness factor from explicit caller-supplied inputs.