The air in a house is at 25^∘ C and 65 percent relative humidity. Now the air is cooled at const

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The air in a house is at 25^∘ C and 65 percent relative...

The air in a house is at $25^{\circ} \mathrm{C}$ and 65 percent relative humidity. Now the air is cooled at constant pressure. The temperature at which the moisture in the air will start condensing is (a) $7.4^{\circ} \mathrm{C}$ (b) $16.3^{\circ} \mathrm{C}$ (c) $18.0^{\circ} \mathrm{C}$ (d) $11.3^{\circ} \mathrm{C}$ (e) $20.2^{\circ} \mathrm{C}$

The air in a house is at $25^{\circ} \mathrm{C}$ and 65 percent relative humidity. Now the air is cooled at constant pressure. The temperature at which the moisture in the air will start condensing is
(a) $7.4^{\circ} \mathrm{C}$
(b) $16.3^{\circ} \mathrm{C}$
(c) $18.0^{\circ} \mathrm{C}$
(d) $11.3^{\circ} \mathrm{C}$
(e) $20.2^{\circ} \mathrm{C}$

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Key Concepts

Relative Humidity

Relative humidity is a measure of the current amount of water vapor in the air compared to the maximum amount that the air can hold at that particular temperature, expressed as a percentage. It is a key parameter in determining how close the air is to becoming saturated with moisture, influencing various processes like condensation and evaporation.

Dew Point Temperature

The dew point temperature is the temperature at which air reaches 100% relative humidity, causing water vapor to condense into liquid water. It represents the point where the cooling of the air results in the formation of dew or condensation, and is directly related to the moisture content in the air.

Saturation Vapor Pressure

Saturation vapor pressure refers to the maximum pressure exerted by water vapor in the air when it is saturated at a given temperature. This concept is crucial for understanding phase changes in water, as it determines when air transitions from being unsaturated to saturated, triggering condensation phenomena.

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