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Search the sky for passing jets anti look for the condensation trail—contrail—that the Jet leaves behind. Because jet exhaust is mainly carbon dioxide and water vapor, when the water vapor mixes with the cold environment of the upper troposphere, it can condense into small water droplets to form a line of white “clouds”.
Study the length and thickness of the contrails. You may even take a photo. After about 10 minutes, reexamine the contrails. Are they still there? Have they dissipated, or have they grown thicker? If they have disappeared, or if the jet did not leave a contrail, the humidity of the atmosphere is too low to create clouds and produce rain. So it is safe to say that tomorrow's weather will probably be very similar to today’s weather. If the contrails are still present and have grown thicker, the humidity of the atmosphere is high enough for cloud formation. And with clouds can come precipitation. So tomorrow's weather may be very different from today's.
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Chapter 25 Solutions
EBK CONCEPTUAL PHYSICAL SCIENCE
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- On a winter day, a psychrometer has a dry-bulb reading of 35F and a wet-bulb reading of 29F. (a) What is the actual moisture content of the air? (b) Would the water in the wick of the wet bulb freeze? Explain.arrow_forwardAs air rises in the atmosphere, its temperature drops, even if no heat flows out of it. (a) Based on what you learned in Sections 4.4 and 5.3, explain why this is so. (b) Cumulus clouds form when rising air is cooled to the point where water droplets form because of condensation. Why are these clouds usually much higher above the ground in dry climates than in wet ones?arrow_forward4.2. What is the normal range of the air relative humidity for residential premises? Choose the correct answer: 1. 20-40%; 2. 20-50%; 3. 30-60%; 4. 35-70%; 5. 40-80%;arrow_forward
- What are the assumptions of an air-standard analysis? Cold air-standard analysis?arrow_forward17. 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 Aarrow_forwardExplain why an air parcel cools at the wet adiabatic rate above the LCL.arrow_forward
- Would you expect the temperature of air to drop as it undergoes a steady-flow throttling process? Explain.arrow_forwardWhy will clouds tend to form above either a flat or a mountainous island in the middle of the ocean? (Hint: Compare the specific heat capacity of the land with that of the water and the subsequent convection currents in the air.)arrow_forwardExplain why the 2-4 inch thick layer of blubber on a polar bear helps to keep polar bears warm during frigid artic weather.arrow_forward
- What occurs when air is subjected to less pressure? A The air becomes compressed. The air expands. The air rises in temperature. O D The air condenses.arrow_forwardCalculate the change in air pressure you will experience if you climb a 1000-m mountain, assuming that the temperature and air density do not change over this distance and that they were 22°C and 1.2 kg/m³, respectively, at the bottom of the mountain.arrow_forward17. 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 Aarrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningAn Introduction to Physical SciencePhysicsISBN:9781305079137Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar TorresPublisher:Cengage Learning
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