Weather & Calamities

Intermediate

Saturation Vapour Pressure

The maximum water-vapour pressure air can hold at a given temperature (Tetens formula).

Formula

e_s = 0.6108\,\exp\!\left(\frac{17.27\,T}{T + 237.3}\right)

Variables

eₛSaturation vapour pressure (kPa)

TAir temperature (°C)

Example

At 25°C, eₛ ≈ 3.17 kPa

Did You Know?

Warm air holds exponentially more moisture — roughly 7% more water vapour per °C.

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