The effect of increase in temperature on a sample of air that has a relatively constant amount of water vapor.

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Chapter 17.3, Problem 1SC

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The effect of increase in temperature on a sample of air that has a relatively constant amount of water vapor.

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a. If the absolute humidity of air is 27.6 g/kg, how many grams of water vapor are there in the 4.8 kg of air? b. Air at temperature 20.0°C contains some water vapor. If the partial pressure of water vapor is 1.98 kPa, what is the relative humidity of the air in %? The saturation water vapor pressure at 20.0°C is 2.34 kPa. c. If the relative humidity of air is 80 % at 18.0°C, what is the partial pressure of water vapor in the air in the unit of kPa? The saturation water vapor pressure at 18.0°C is 2.07 kPa.

17. Which of the following three statements concerning relative humidity values of 30% and 40% are true? Note that when the relative humidityis 30%, the air temperature may be diff erent than it is when the relativehumidity is 40%. A. It is possible that at a relative humidity of 30% there is a smaller partial pressure of water vapor in the air than there is at a relativehumidity of 40%.B. It is possible that there is the same partial pressure of water vapor in the air at 30% and at 40% relative humidity. C. It is possible that at a relative humidity of 30% there is a greater partial pressure of water vapor in the air than there is at a relative humidity of 40%.(a) A, B, and C (b) Only A and B (c) Only A and C (d) Only B and C(e) Only A

17. Which of the following three statements concerning relative humid- ity valucs of 30% and 40% arc true? Note that when the relative humidity is 30%, the air temperature may be different than it is when the relative humidity is 40%. A. It is possible that at a relative humidity of 30% there is a smaller partial pressure of water vapor in the air than there is at a relative humidity of 40%. B. It is possible that there is the same partial pressure of water va- por in the air at 30% and at 40% relative humidity. C. It is possible that at a relative humidity of 30% there is a greater partial pressure of water vapor in the air than there is at a relative humidity of 40%. (a) A, B, and C (b) Only A and B (c) Only A and C (d) Only B and C (e) Only A