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Partial Pressure of Water Vapour Equation:
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Partial pressure of water vapour (e) is the pressure exerted by water vapor in a mixture of gases. It represents the contribution of water vapor to the total pressure of the gas mixture and is a key parameter in atmospheric science and thermodynamics.
The calculator uses the partial pressure equation:
Where:
Explanation: The equation calculates the actual vapor pressure based on the relative humidity percentage and the maximum vapor pressure possible at that temperature (saturation vapor pressure).
Details: Calculating partial pressure of water vapour is essential for understanding humidity levels, predicting weather patterns, designing HVAC systems, and various industrial processes where moisture control is critical.
Tips: Enter relative humidity as a percentage (0-100%) and saturation vapor pressure in Pascals (Pa). Both values must be valid positive numbers.
Q1: What is saturation vapor pressure?
A: Saturation vapor pressure (e_s) is the maximum pressure of water vapor that can exist in equilibrium with its liquid phase at a given temperature.
Q2: How does temperature affect partial pressure?
A: Temperature directly affects saturation vapor pressure, which increases exponentially with temperature, thereby influencing the partial pressure calculation.
Q3: What units are used for partial pressure?
A: Partial pressure is typically measured in Pascals (Pa) or millibars (mb), with 1 mb = 100 Pa.
Q4: Why is relative humidity expressed as a percentage?
A: Relative humidity represents the ratio of actual vapor pressure to saturation vapor pressure, expressed as a percentage to indicate how close the air is to saturation.
Q5: Can this calculation be used for other gases?
A: While the concept applies to all gases, this specific equation is designed for water vapor calculations using relative humidity.