Humidity
Relative and absolute humidity, saturation deficit and dew point from the school table or the Magnus formula.
What to find:
Absolute humidity is the grams of water vapor in 1 m³ of air; relative humidity is the percentage of the maximum possible at that temperature.
The humidity calculator finds relative and absolute humidity, how much more water vapor the air can hold, and the dew point. The saturation vapor content comes from the school table or the Magnus formula.
Formulas
φ = a/amax · 100 %
a is the absolute humidity (grams of vapor in 1 m³ of air), amax is the maximum vapor content at the given temperature.
| t, °C | −20 | −10 | 0 | +10 | +20 | +30 |
|---|---|---|---|---|---|---|
| amax, g/m³ | 1 | 2 | 5 | 9 | 17 | 30 |
The warmer the air, the more vapor it can hold. When air cools to the dew point, the relative humidity reaches 100 % and vapor condenses into dew, fog and clouds.
Example. At +20 °C, 1 m³ of air contains 8.5 g of vapor: φ = 8.5 / 17 · 100 % = 50 %.
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