Dew-Point Temperature One measure of the amount of water in...

Dew-Point Temperature One measure of the amount of water in the atmosphere is the dew point, the temperature at which the atmosphere's water content would be in equilibrium with liquid water and droplets of dew would begin to form. (a) On a warm summer day when the dew-point temperature is $68^{\circ} \mathrm{F}$ , what is the pressure of water in the atmosphere? Refer to Figure $17-35$ and note that the pressure of the water vapor (called the partial pressure of water) is equal to the vapor pressure at the dew-point temperature. (b) If the weather changes and the partial pressure of water is reduced to 1.7 $\mathrm{kPa}$ , what is the new dew-point temperature?

Dew-Point Temperature One measure of the amount of water in the atmosphere is the dew point, the temperature at which the atmosphere's water content would be in equilibrium with liquid
water and droplets of dew would begin to form. (a) On a warm summer day when the dew-point temperature is $68^{\circ} \mathrm{F}$ , what is the pressure of water in the atmosphere? Refer to Figure $17-35$ and note that the pressure of the water vapor (called the partial pressure
of water) is equal to the vapor pressure at the dew-point temperature. (b) If the weather changes and the partial pressure of water is reduced to 1.7 $\mathrm{kPa}$ , what is the new dew-point temperature?

Key Concepts

Dew Point Temperature

The dew point is the temperature at which the air becomes saturated with water vapor and condensation begins, meaning that the atmospheric water vapor is in equilibrium with liquid water. It is a key metric in meteorology for determining humidity levels and predicting the onset of dew, fog, or cloud formation.

Vapor Pressure

Vapor pressure is the pressure exerted by a vapor when it is in equilibrium with its liquid (or solid) phase at a given temperature. It is a fundamental concept in thermodynamics that helps in understanding phenomena such as evaporation and condensation, as well as the behavior of humid air.

Partial Pressure

Partial pressure refers to the pressure of a specific gas within a mixture of gases, with the total pressure being the sum of all individual partial pressures. In the context of atmospheric science, the partial pressure of water vapor determines how close the air is to saturation, which in turn influences the dew point temperature.

Saturation Vapor Pressure

Saturation vapor pressure is the maximum pressure that water vapor can exert at a given temperature without resulting in condensation. This concept is crucial in understanding phase changes in water and plays an important role in determining the dew point, relative humidity, and overall weather conditions.

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