1. What Is Water Vapor Pressure?

Water vapor pressure is the partial pressure of water vapor in any gas mixture. It represents the contribution of water vapor to the total pressure and is a key parameter in meteorology, HVAC, and various industrial processes.

2. How Does The Calculator Work?

The calculator uses the water vapor pressure equation:

Where:

• \( e \) — Water vapor pressure (hPa)
• \( RH \) — Relative humidity (%)
• \( e_s \) — Saturation vapor pressure (hPa)

Explanation: The equation calculates the actual vapor pressure by multiplying the saturation vapor pressure by the relative humidity expressed as a decimal.

3. Importance Of Water Vapor Pressure Calculation

Details: Accurate water vapor pressure calculation is essential for weather forecasting, humidity control in buildings, industrial processes, and understanding various atmospheric phenomena.

4. Using The Calculator

Tips: Enter relative humidity as a percentage (0-100%) and saturation vapor pressure in hPa. Both values must be valid (RH between 0-100, e_s > 0).

5. Frequently Asked Questions (FAQ)

Q1: What is saturation vapor pressure?
A: Saturation vapor pressure is the maximum vapor pressure that can exist at a given temperature, when the air is saturated with water vapor.

Q2: How does temperature affect water vapor pressure?
A: Saturation vapor pressure increases exponentially with temperature, meaning warmer air can hold more water vapor.

Q3: What units are used for vapor pressure?
A: Vapor pressure is commonly measured in hectopascals (hPa), millibars (mb), or pascals (Pa). 1 hPa = 1 mb = 100 Pa.

Q4: How is this different from dew point?
A: Dew point is the temperature at which air becomes saturated, while vapor pressure is the actual partial pressure of water vapor in the air.

Q5: Why is water vapor pressure important in weather forecasting?
A: It helps determine humidity levels, predict fog formation, and is a key factor in calculating various stability indices and precipitation potential.