This vapor pressure of water calculator helps you determine the vapor pressure of water in millimeters of mercury (mmHg) based on temperature. It instantly calculates the vapor pressure of water at any given temperature between 1°C and 100°C – the range where liquid water exists under normal conditions.
Vapor pressure is the pressure created by water molecules turning into gas. It is important in chemistry, weather science, and engineering.
Vapor Pressure of Water Calculator
How the Vapor Pressure of Water Calculator Works
Using this Vapor Pressure of Water Calculator is simple:
- Enter Water Temperature – Type the temperature in Celsius (e.g., 25°C).
- Click “Calculate” – The tool processes the data instantly.
- Get Vapor Pressure – The result appears in mmHg (e.g., 23.76 mmHg at 25°C).
Example Calculation
If you input 25°C, the calculator uses the Antoine Equation to give 23.76 mmHg. No manual math needed.
Formula & Scientific Background
The most trusted formula for calculating water vapor pressure is the Antoine Equation:
P = 10^(A – B/(C + T))
Where:
- P = Vapor pressure (mmHg)
- T = Temperature (°C)
- A, B, C = Constants specific to water (A = 8.07131, B = 1730.63, C = 233.426)
This equation works best between 0°C to 100°C, making it perfect for most scientific and educational uses.
Benefits of Using Our Vapor Pressure Calculator
- Saves Time – No need for manual calculations.
- Reduces Errors – Eliminates formula mistakes.
- User-Friendly – Simple for beginners and experts.
- Educational Value – Great for learning thermodynamics.
FAQs
Can this calculator work for other liquids?
No, it only works for water. Other liquids, like ethanol or acetone need different formulas.
Why is mmHg used instead of Pascals?
mmHg is a traditional unit in chemistry and medicine. Many experiments still use it.