Specific Humidity Calculator

Formula

The formula to calculate the Specific Humidity (SH) is:

\[ SH = \left(0.622 \times \frac{P}{P - Pw}\right) \times 100 \]

Where:

\(SH\) is the Specific Humidity (%)
\(P\) is the Total Pressure (Pa)
\(Pw\) is the Partial Pressure of Water Vapor (Pa)

What is Specific Humidity?

Specific humidity is defined as the ratio of the humidity of the air to the absolute water vapor pressure of the air. It represents the mass of water vapor per unit mass of air, providing a measure of the moisture content in the air.

Example Calculation

Let's assume the following values for an example:

Total Pressure (P) = 101325 Pa
Partial Pressure of Water Vapor (Pw) = 2330 Pa

Using the formula:

\[ SH = \left(0.622 \times \frac{2330}{101325 - 2330}\right) \times 100 \approx 1.46 \% \]

The Specific Humidity is approximately 1.46%.