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Why is relative humidity called a temperature-dependent indicator?

Answer and explanation

Correct answer: Because saturation vapour pressure changes with temperature

Correct answer: A. Relative humidity compares the actual water-vapour content of air with the maximum vapour content the air could hold at the same temperature. In pressure form, it is commonly expressed as actual vapour pressure divided by saturation vapour pressure, multiplied by 100. Saturation vapour pressure changes with temperature: warmer air has a higher saturation value, while cooler air has a lower one. Therefore, even if the actual amount of water vapour stays unchanged, relative humidity can rise when air cools and fall when air warms. Option B is wrong because temperature directly affects saturation capacity. Option C is wrong because relative humidity is not a rainfall measurement. Option D is wrong because it is not altitude. Memory cue: relative humidity is a comparison with temperature-dependent capacity, not just the amount of vapour.

Related tags

Relative HumidityTemperatureSaturation Vapour PressureHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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