1. What is the Saturation Pressure of Water Vapor?

The saturation pressure of water vapor is the maximum partial pressure that water vapor can have in air at a given temperature without condensing. It represents the pressure at which air becomes fully saturated with water vapor.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( p_s \) — Partial Pressure of Water Vapour in Saturated Air (Pascal)
• \( p_v \) — Pressure of Water Vapor (Pascal)
• \( \Phi \) — Relative Humidity (0-1)

Explanation: This formula calculates the saturation pressure by dividing the actual water vapor pressure by the relative humidity, which represents the ratio of actual vapor pressure to saturation vapor pressure.

3. Importance of Saturation Pressure Calculation

Details: Calculating saturation pressure is crucial for understanding atmospheric conditions, predicting weather patterns, designing HVAC systems, and studying evaporation and condensation processes in various industrial applications.

4. Using the Calculator

Tips: Enter water vapor pressure in Pascal, relative humidity as a value between 0 and 1. Both values must be positive, with relative humidity not exceeding 1.

5. Frequently Asked Questions (FAQ)

Q1: What is the relationship between saturation pressure and temperature?
A: Saturation pressure increases exponentially with temperature. Warmer air can hold more water vapor before becoming saturated.

Q2: How does relative humidity affect saturation pressure calculations?
A: Relative humidity is the ratio of actual vapor pressure to saturation vapor pressure, so knowing both allows calculation of the saturation pressure.

Q3: What are typical values for water vapor saturation pressure?
A: At room temperature (20°C), saturation pressure is about 2330 Pascal. At 100°C (boiling point), it's 101325 Pascal (1 atmosphere).

Q4: Why is saturation pressure important in meteorology?
A: It helps predict dew point, fog formation, and precipitation. When actual vapor pressure reaches saturation pressure, condensation occurs.

Q5: How does altitude affect saturation pressure calculations?
A: Saturation pressure depends primarily on temperature, not altitude. However, atmospheric pressure decreases with altitude, affecting the partial pressures of all gases.