Vapor Pressure Of Water Calculator Torr

Vapor Pressure Equation:

\[ e_s = 6.112 \times \exp\left(\frac{17.67 \times T}{T + 243.5}\right) \times 0.75006 \]

Vapor Pressure (e_s):

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1. What is Vapor Pressure of Water?

Vapor pressure is the pressure exerted by water vapor in thermodynamic equilibrium with its condensed phases at a given temperature. It represents the tendency of water molecules to escape from the liquid phase into the gas phase.

2. How Does the Calculator Work?

The calculator uses the vapor pressure equation:

\[ e_s = 6.112 \times \exp\left(\frac{17.67 \times T}{T + 243.5}\right) \times 0.75006 \]

Where:

\( e_s \) — Vapor pressure of water (torr)
\( T \) — Temperature (°C)
\( \exp \) — Exponential function
0.75006 — Conversion factor from hPa to torr

Explanation: This equation calculates the saturation vapor pressure of water at a given temperature, converted from hectopascals to torr units.

3. Importance of Vapor Pressure Calculation

Details: Vapor pressure calculations are essential in meteorology, HVAC systems, industrial processes, and environmental science for understanding humidity, evaporation rates, and phase change dynamics.

4. Using the Calculator

Tips: Enter temperature in degrees Celsius. The calculator will compute the vapor pressure of water in torr units at the specified temperature.

5. Frequently Asked Questions (FAQ)

Q1: What is the relationship between temperature and vapor pressure?
A: Vapor pressure increases exponentially with temperature - as temperature rises, more water molecules have sufficient energy to escape into the vapor phase.

Q2: Why convert from hPa to torr?
A: Torr is a common unit in many scientific and engineering applications, particularly in vacuum technology and barometric pressure measurements.

Q3: What is the physical significance of the constants in the equation?
A: The constants 6.112, 17.67, and 243.5 are empirically determined parameters that provide the best fit to experimental vapor pressure data for water.

Q4: How accurate is this equation?
A: This equation provides excellent accuracy for most practical applications, typically within 0.1% of measured values for temperatures between 0°C and 100°C.

Q5: Can this be used for other liquids?
A: No, this specific equation is calibrated for pure water. Other liquids have different vapor pressure characteristics and require different equations.