Chemistry

Vapor Pressure of Water Calculator

Find water's vapor pressure at a temperature.

Calculated Output

Vapor pressure (kPa) 3.168

Vapor pressure (mmHg) 23.76

Formula: Tetens: P = 0.61078 · e^(17.27T/(T+237.3))

Step-by-Step Breakdown

1. Values used:

2. Temperature = 25 °C

4. Vapor pressure = 3.168kPa

5. Vapor pressure = 23.76mmHg

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The math behind it

The Tetens formula: P (kPa) = 0.61078 × e^(17.27T ÷ (T + 237.3)), with T in °C.

25 °C → ~3.17 kPa (23.8 mmHg).

Use?

Humidity, dew point and gas-collection corrections.