Dew-Point Temperature One measure of the amount of water in the atmosphere is th

Question

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. On a warm summer day when the dew-point temperature is 68 degree F, what is the pressure of water in the atmosphere? Refer to (Figure 1) and note that the pressure of the water vapor (called the partial pressure of water) is equal to the vapor pressure at tho dew-point temperature. Express your answer to two significant figures and include appropriate units. If the weather changes and the partial pressure of water is reduced to 1.7 kPa, what is the new dew-point temperature? Express your answer to two significant figures and include appropriate units.

Explanation / Answer

Answer of Part - A

First of all here given that the dew-point temperature is 68 0F = 20 0C

From the graph at 20 0C temp , vapor pressure water is 2.33 kPa = pressure of water in atmosphere

Answer of Part - B

Now if the weather change and partial pressure of water changed to 1.7 Kpa

Then from the graph that at 1.7 Kpa, Temperature is 15 0C = 59 0F = New dew-point temperature

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