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Absolute Humidity Formula:
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Absolute Humidity is the actual amount of water vapor present in the air, regardless of the temperature. It represents the mass of water vapor per unit mass of dry air.
The calculator uses the Absolute Humidity formula:
Where:
Explanation: The formula converts molal humidity (moles of vapor per mole of dry gas) to absolute humidity (mass of vapor per mass of dry air) using the molecular weight ratio of water to air.
Details: Absolute humidity is crucial in various applications including meteorology, HVAC systems design, industrial processes, and environmental monitoring where precise moisture content measurement is required.
Tips: Enter molal humidity value in mol/mol. The value must be non-negative. The calculator will provide the absolute humidity in Kg of water vapour per Kg of air.
Q1: What is the difference between absolute humidity and relative humidity?
A: Absolute humidity measures the actual water vapor content, while relative humidity expresses the current moisture level as a percentage of the maximum possible at that temperature.
Q2: Why is 0.6207 used as the conversion factor?
A: This factor represents the ratio of the molecular weight of water (18.015 g/mol) to the molecular weight of dry air (approximately 28.964 g/mol).
Q3: In what units is absolute humidity typically expressed?
A: Absolute humidity is commonly expressed in grams of water vapor per kilogram of dry air or kilograms of water vapor per kilogram of dry air.
Q4: What are typical absolute humidity values in different environments?
A: Desert environments may have values below 5 g/kg, while tropical environments can exceed 20 g/kg. Indoor comfort levels typically range between 5-12 g/kg.
Q5: How does temperature affect absolute humidity?
A: Absolute humidity is independent of temperature - it measures the actual water content. However, the maximum possible absolute humidity increases with temperature.