1. What is the August Roche Magnus Formula?

The August Roche Magnus formula calculates saturation vapour pressure at water surface based on temperature. It provides an empirical relationship between temperature and the maximum amount of water vapor the air can hold.

2. How Does the Calculator Work?

The calculator uses the August Roche Magnus formula:

Where:

• \( e_s \) — Saturation Vapour Pressure (mm of mercury)
• \( T \) — Temperature (°C)
• \( \exp \) — Exponential function

Explanation: The formula uses an exponential function to model the non-linear relationship between temperature and saturation vapour pressure, with specific coefficients optimized for water surfaces.

3. Importance of Saturation Vapour Pressure Calculation

Details: Accurate saturation vapour pressure calculation is crucial for meteorological forecasting, humidity measurement, climate studies, and various engineering applications involving air-water interactions.

4. Using the Calculator

Tips: Enter temperature in degrees Celsius. The calculator will compute the saturation vapour pressure in mm of mercury.

5. Frequently Asked Questions (FAQ)

Q1: What is saturation vapour pressure?
A: Saturation vapour pressure is the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases at a given temperature.

Q2: Why use the August Roche Magnus formula?
A: This formula provides a good approximation of saturation vapour pressure over water surfaces and is widely used in meteorological applications.

Q3: What are typical saturation vapour pressure values?
A: Values range from about 0.6 kPa at 0°C to about 101.3 kPa at 100°C (at sea level pressure).

Q4: How does temperature affect saturation vapour pressure?
A: Saturation vapour pressure increases exponentially with temperature - warmer air can hold significantly more water vapor.

Q5: Are there limitations to this formula?
A: The formula is most accurate for temperatures between 0°C and 60°C and may have reduced accuracy at extreme temperatures.