Humidity — Flashcards

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Humidity is the amount of water vapour present in the air at a particular time and place. It changes from place to place and with temperature.

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Relative humidity is the ratio between the actual amount of water vapour present in the air and the maximum amount of water the air can hold at that temperature, expressed as a percentage. A value of …

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Relative Humidity = (The actual amount of water vapour present in the air / The maximum amount of water vapour the air can hold at that temperature) × 100. The answer is always expressed in percentage…

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Absolute humidity is the actual amount of water vapour present in a given volume of air, regardless of temperature. It is expressed in grams of moisture per cubic metre of air, written as g/m3.

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Relative humidity shows how close the air is to saturation and is written as a percentage. Absolute humidity shows the actual amount of water vapour in air and is written in g/m3. Relative humidity ch…

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Humidity decreases with height because rarified air cannot hold more moisture. So air near the ground usually contains more moisture than air at higher levels.

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When relative humidity is high, sweat does not evaporate easily from the body. Since evaporation cools the body, less evaporation makes the air feel hotter than the actual temperature.

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When relative humidity is low, sweat evaporates easily from the skin. This evaporation removes heat from the body, so the air feels cooler than the actual temperature.