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In (RH=\frac{e}{e_s}\times100), what does (e_s) mean?

Answer and explanation

Correct answer: Saturation vapour pressure

Relative humidity compares the actual amount of water vapour in air with the maximum amount the air could hold at the same temperature. In the formula \(RH=\frac{e}{e_s}\times100\), the symbol \(e\) represents actual vapour pressure, while \(e_s\) represents saturation vapour pressure. Saturation vapour pressure is the pressure exerted by water vapour when the air is saturated at that temperature.

Therefore, option A is correct. The ratio is multiplied by 100 to express the comparison as a percentage. Wind speed, rainfall amount, and ocean salinity are different physical quantities and cannot occupy the role of \(e_s\). Temperature matters because saturation vapour pressure changes with temperature.

Related tags

Relative HumidityFormulaVapour Pressure

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