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Partial Pressure of Water Formula:
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Partial pressure of water vapor (e) is the pressure exerted by water vapor in a mixture of gases. It's a key parameter in meteorology, HVAC systems, and various scientific applications where humidity measurement is important.
The calculator uses the formula:
Where:
Explanation: The formula calculates the actual vapor pressure from the relative humidity and the maximum possible vapor pressure at a given temperature.
Details: Calculating partial pressure of water is essential for determining dew point, relative humidity, and understanding various atmospheric processes. It's crucial in weather forecasting, climate studies, and industrial processes where humidity control is important.
Tips: Enter relative humidity as a percentage (0-100%) and saturation vapor pressure in hPa. The saturation vapor pressure depends on temperature and can be calculated using various formulas like the Magnus formula or obtained from reference tables.
Q1: What is saturation vapor pressure?
A: Saturation vapor pressure is the maximum pressure of water vapor that can exist at a given temperature. It increases with temperature.
Q2: How is saturation vapor pressure determined?
A: It can be calculated using various empirical formulas like the Magnus formula, Arden Buck equation, or obtained from psychrometric charts.
Q3: What are typical values for partial pressure of water?
A: At room temperature (20°C), e_s is about 23.4 hPa. With 50% RH, the partial pressure would be approximately 11.7 hPa.
Q4: Why is partial pressure important in meteorology?
A: It's used to calculate dew point, relative humidity, and is a key parameter in weather models and forecasting.
Q5: How does altitude affect partial pressure calculations?
A: While the formula remains the same, atmospheric pressure decreases with altitude, which affects the absolute humidity measurements.