1. What is the Vapor Pressure Water Calculator?

Definition: This calculator estimates the vapor pressure of water based on temperature using the Buck equation.

Purpose: It helps scientists, engineers, and students determine the equilibrium vapor pressure of water at a given temperature.

2. How Does the Calculator Work?

The calculator uses the Buck equation:

Where:

• \( P \) — Vapor pressure (Pascals)
• \( T \) — Temperature (°C)

Explanation: The Buck equation is an empirical relationship that accurately describes the vapor pressure of water as a function of temperature.

3. Importance of Vapor Pressure Calculation

Details: Vapor pressure is crucial for understanding evaporation rates, humidity, boiling points, and various industrial processes.

4. Using the Calculator

Tips: Enter the temperature in degrees Celsius. The valid range is typically between -100°C and 200°C.

5. Frequently Asked Questions (FAQ)

Q1: What is the Buck equation?
A: An empirical formula that calculates the vapor pressure of water as a function of temperature, accurate for temperatures between 0°C and 100°C.

Q2: What are the units for the result?
A: The result is given in Pascals (Pa), the SI unit for pressure.

Q3: How accurate is the Buck equation?
A: It's very accurate for typical atmospheric conditions (0-100°C) with an error of less than 0.1% in this range.

Q4: Can I use this for temperatures below 0°C?
A: Yes, it can be used for supercooled water down to about -100°C, though with reduced accuracy at extreme temperatures.

Q5: How does this differ from the Antoine equation?
A: Both are empirical equations, but the Buck equation is simpler and specifically designed for water, while the Antoine equation can be adapted for various substances.