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Atmospheric Water-Vapor Mixing Ratio Calculator — result sheet
Calculate the water-vapor mixing ratio from vapor pressure and total atmospheric pressure.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Mixing ratio w = εe/(p−e), where ε = 0.622, e is vapor pressure, and p is total pressure.
The result is the mass of water vapor per mass of dry air for the entered pressure state.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Water-vapor pressure — hPa; minimum 1.0E-6; maximum 2000
- Total air pressure — hPa; minimum 1.0E-6; maximum 2000
Worked example
| Input | Value |
|---|---|
| Water-vapor pressure | 15 |
| Total air pressure | 1013.25 |
Mixing ratio ≈ 0.00935 kg/kg = 9.35 g/kg.
Assumptions and limits
- Vapor pressure is positive and smaller than total pressure.
- Pressures use the same unit because their ratio is dimensionless.
- The ideal moist-air relation does not model condensate, supersaturation, or detailed composition corrections.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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