1. What is a Saturation Vapor Pressure Calculator?

Definition: This calculator estimates the saturation vapor pressure based on air temperature using the Magnus formula.

Purpose: It helps meteorologists, engineers, and scientists determine the maximum water vapor pressure at a given temperature.

2. How Does the Calculator Work?

The calculator uses the Magnus formula:

Where:

• \( P \) — Saturation vapor pressure (hPa)
• \( T \) — Temperature (°C)
• \( e \) — Euler's number (~2.71828)

Explanation: The formula approximates the relationship between temperature and the maximum water vapor pressure in air.

3. Importance of Saturation Vapor Pressure

Details: This calculation is essential for weather forecasting, HVAC design, and understanding humidity and evaporation processes.

4. Using the Calculator

Tips: Enter the temperature in degrees Celsius. The temperature must be above absolute zero (-273.15°C).

5. Frequently Asked Questions (FAQ)

Q1: What units does this calculator use?
A: Temperature in °C and output in hectopascals (hPa), which is equivalent to millibars.

Q2: How accurate is this formula?
A: The Magnus formula is accurate to within ±0.4% for temperatures between -20°C and +50°C.

Q3: What's the physical meaning of saturation vapor pressure?
A: It's the maximum partial pressure of water vapor that can exist in equilibrium with liquid water at a given temperature.

Q4: Can I use this for temperatures below freezing?
A: Yes, but note this calculates vapor pressure over liquid water, not ice (which would require a different formula).

Q5: How does this relate to relative humidity?
A: Relative humidity = (actual vapor pressure / saturation vapor pressure) × 100%.