Description
Return a homogeneous layer's vapor resistance.
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.
Return a homogeneous layer's vapor resistance.
When to use this tool
Use Vapor Permeability Resistance Factor when converting the stated material-property basis using compatible supplied quantities.
How to use the tool and how it works
- Enter permeability, thickness. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read resistance. Use the output convention below.
Return a homogeneous layer's vapor resistance. Require positive thickness and permeability; resistance = thickness/permeability.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| permeability | Permeability | Required. Finite number; strictly above 0. |
| thickness | Thickness | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| resistance | Resistance | Required. Finite number. |
{
"input": {
"permeability": 2,
"thickness": 6
},
"output": {
"resistance": 3
}
}Limitations and assumptions
- The units follow the chosen vapor-driving-potential convention; surface resistances and complete assembly behavior are omitted.
- 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
- Permeance Thickness Permeability Factor
Convert permeance to permeability for a supplied layer thickness.
- Convert Electrical Resistance
Convert finite electrical resistance values between supported units.