1. What is Water Vapor Saturation Pressure?

Definition: The pressure exerted by water vapor in thermodynamic equilibrium with its condensed phases at a given temperature.

Purpose: Important in meteorology, HVAC design, chemical engineering, and various industrial processes.

2. How Does the Calculator Work?

The calculator uses the Antoine equation:

Where:

• \( P \) — Saturation pressure (mmHg)
• \( T \) — Temperature (°C)

Explanation: This empirical relationship describes the relation between vapor pressure and temperature for water.

3. Importance of Saturation Pressure

Details: Knowing saturation pressure is crucial for humidity calculations, distillation processes, and predicting condensation conditions.

4. Using the Calculator

Tips: Enter the temperature in °C (valid range -100°C to 200°C). The calculator will compute the saturation pressure in mmHg.

5. Frequently Asked Questions (FAQ)

Q1: What is the Antoine equation?
A: A semi-empirical relationship between vapor pressure and temperature, with constants specific to each substance.

Q2: How accurate is this calculation?
A: Very accurate for water between 1°C and 100°C, reasonable from -100°C to 200°C.

Q3: Can I use this for other substances?
A: No, this uses water-specific constants. Other substances have different Antoine equation parameters.

Q4: What units does this use?
A: Temperature in Celsius (°C) and pressure in millimeters of mercury (mmHg).

Q5: What's the physical meaning of saturation pressure?
A: The maximum vapor pressure that can exist for a given temperature before condensation occurs.