Concept explainers
(a)
The relative humidity.
(a)
Answer to Problem 6E
Explanation of Solution
Given info: The dry-bulb and wet-bulb readings of a psychrometer are
Explanation:
Wet-bulb depression is the difference in the dry-bulb and wet-bulb reading.
The expression for the wet-bulb depression is as follows,
Here,
Substitute
Refer table H.1 in Appendix H provided in the textbook to find the relative humidity.
The relative humidity of the air is
Conclusion:
Therefore, the relative humidity is
(b)
The dew point.
(b)
Answer to Problem 6E
Explanation of Solution
Given info: The dry-bulb and wet-bulb readings of a psychrometer are
Explanation:
Wet-bulb depression is the difference in the dry-bulb and wet-bulb reading.
The expression for the wet-bulb depression is as follows,
Here,
Substitute
Refer table H.2 in Appendix H provided in the textbook to find the dew point.
The dew point is
Conclusion:
The dew point of the air is
(c)
The maximum moisture capacity of the air.
(c)
Answer to Problem 6E
Explanation of Solution
Given info: The dry-bulb and wet-bulb readings of a psychrometer are
Explanation:
Wet-bulb depression is the difference in the dry-bulb and wet-bulb reading.
The expression for the wet-bulb depression is as follows,
Here,
Substitute
Refer table H.1 in Appendix H provided in the textbook to find the maximum moisture capacity of the air.
The maximum moisture capacity of the air is
Conclusion:
The maximum moisture capacity of the air is
(d)
The actual moisture content of the air.
(d)
Answer to Problem 6E
Explanation of Solution
Given info: The dry-bulb and wet-bulb readings of a psychrometer are
Explanation:
The expression for the relative humidity is as follows,
Here,
Rearrange equation (1) to get an expression for the actual moisture content of the air.
Substitute
The actual moisture content of the air is
Conclusion:
The actual moisture content of the air is
Want to see more full solutions like this?
Chapter 19 Solutions
An Introduction to Physical Science
- On a day when the air temperature is 85F, the wet-bulb reading of a psychrometer is 70F. Find each of the following: (a) relative humidity, (b) dew point, (c) maximum moisture capacity of the air, and (d) actual moisture content of the air.arrow_forwardWhen is the relative humidity 100%? It may be raining, but a sheltered psychrometer doesnt read 100%. Why?arrow_forwardIf the air temperature is 20C at sea level, then what is the temperature outside a jet aircraft flying at an altitude of 10,000 m?arrow_forward
- A sling psychrometer can measure humidity because Answer, the dry bulb will measure the same temperature no matter how much water is in the air. Answer, the cooling of the wet bulb is independent of the amount of water in the air. Answer, the heating of the dry bulb is proportional to the amount of water in the air. Selected Answer, the cooling of the wet bulb is proportional to the amount of water in the air. Answer, the heating of the wet bulb is proortional to the amount of water in the air. Answer, the cooling of the dry bulb is proportional to the amount of water in the air.arrow_forward1.3 kg of air contains 3.9 g of water vapor in it. What is the absolute humidity of the air in the unit of g/kgarrow_forwardWhich instrument is used to measure humidity? A) Pyrometer B) Hydrometer C) Hygrometer D) Calorimeterarrow_forward
- Consider an airplane flying at a pressure altitude of 11,650m and a density altitude of 11,780m. Calculate the outside air temperature.arrow_forwardAt an altitude of 18km. calculate the standard atmospheric values of pressure, density and temperature.arrow_forwardDuring the Northern Hemisphere’s summer, the daylighthours in northern latitudes are longer than in middle latitudes. Explain why northern latitudes are not warmer. Draw your answer.arrow_forward
- An Introduction to Physical SciencePhysicsISBN:9781305079137Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar TorresPublisher:Cengage Learning