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Relative Humidity Formula:
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Relative Humidity (RH) is the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at a given temperature. It is expressed as a percentage and indicates how much moisture the air contains relative to the maximum it could hold at that temperature.
The calculator uses the Relative Humidity formula:
Where:
Explanation: The formula calculates the percentage of moisture in the air compared to the maximum amount the air can hold at that temperature.
Details: Accurate relative humidity measurement is crucial for weather forecasting, climate studies, industrial processes, agricultural management, and maintaining comfortable indoor environments.
Tips: Enter actual vapor pressure and saturation vapor pressure in Pascals (Pa). Both values must be valid (greater than 0) and actual vapor pressure should not exceed saturation vapor pressure.
Q1: What is the difference between absolute and relative humidity?
A: Absolute humidity is the actual amount of water vapor in the air, while relative humidity is the percentage of moisture relative to the maximum the air can hold at that temperature.
Q2: What are typical relative humidity ranges?
A: Comfortable indoor RH is typically between 30-50%. Below 30% can cause dryness, while above 60% can promote mold growth.
Q3: How does temperature affect relative humidity?
A: Warmer air can hold more moisture, so relative humidity decreases as temperature increases (if moisture content remains constant), and vice versa.
Q4: Why use Pascals as the unit for vapor pressure?
A: Pascals are the SI unit for pressure and provide a standardized measurement for scientific calculations involving vapor pressure.
Q5: Can relative humidity exceed 100%?
A: Under normal conditions, RH cannot exceed 100% as it represents the saturation point. However, supersaturation can occur in certain conditions but is unstable.