1. What is the Tetens Equation?

The Tetens equation is an empirical relationship that calculates the saturation water vapor pressure as a function of temperature. It's widely used in meteorology and engineering applications.

2. How Does the Calculator Work?

The calculator uses the Tetens equation:

Where:

• \( P \) — Water vapor pressure (kPa)
• \( T \) — Absolute temperature (K)
• \( T-273.15 \) — Temperature in Celsius

Explanation: The equation models the exponential relationship between temperature and saturation vapor pressure of water.

3. Importance of Water Vapor Pressure

Details: Water vapor pressure is crucial for understanding humidity, weather patterns, evaporation rates, and various industrial processes.

4. Using the Calculator

Tips: Enter temperature in Kelvin (K). The calculator will compute the saturation water vapor pressure in kilopascals (kPa).

5. Frequently Asked Questions (FAQ)

Q1: What's the temperature range for this equation?
A: The Tetens equation is valid for temperatures between 0°C and 100°C (273.15K to 373.15K).

Q2: How accurate is the Tetens equation?
A: It's accurate to within 0.1% of measured values in the 0-50°C range.

Q3: Can I use Celsius instead of Kelvin?
A: The calculator requires Kelvin input, but the equation internally converts to Celsius.

Q4: What are typical water vapor pressure values?
A: At 25°C (298.15K), saturation vapor pressure is about 3.169 kPa.

Q5: Are there other vapor pressure equations?
A: Yes, including the Antoine equation and Magnus formula, each with different ranges and accuracies.