Lab 6_Humidity and Atmospheric Stability 1

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Utah Valley University *

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1010

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English

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Apr 3, 2024

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docx

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METO 1010 Online Lab 6. Humidity and Atmospheric Stability 1 Instructions: 1) Type your answers in this Microsoft Word file and save your completed lab on your computer. Do not modify the format of the file. 2) Upload your lab on CANVAS by the due date. To upload the file, go to the course homepage and click on “assignments”. Click on the assignment that you want to submit, and on “submit assignment”. In the “file upload” box, click on “choose file” and select the appropriate file. Finally, click on “submit assignment”. Only .doc, .docx, and .pdf files are accepted. 3) In questions that require calculations, you are not required to show every step of your work, but the more detailed your answers are the more likely you are to receive partial credit for wrong answers. 4) Proper units and terminology are always necessary. 1) Fill out the table below. For each change of state of water, indicate its name, whether heat is absorbed or released, and an example from your daily life. The first row has already been filled for you. (3.75 points) Change of State Name Heat (Absorbed or Released?) Daily Life Example Ice→Liquid Water Melting Absorbed Ice cubes melting in a glass Liquid Water→Water Vapor Evaporation Absorbed Boiling water evaporating into the air Ice→Water Vapor Sublimation Absorbed Snow on mountain tops vaporizing Water Vapor→Liquid Water Condensation Released Water vapor condensing around the cup of cold beverage Water Vapor→Ice Deposition Released Frost on the surface 1

of leaves Liquid Water→Ice Freezing Released Freezing water into ice cubes 2) Suppose that 500 g of water vapor condense to make a cloud about the size of an average room. a) If we assume that the latent heat of condensation is 600 cal/g, how much heat would be released to the air? (1 point) Heat released (cal)= 500*600= 300,000 cal b) If the total mass of air before condensation is 100 kg, how much warmer would the air be after condensation? Keep one decimal figure. (4 points) Data/conversion factors needed: mass of air, amount of heat, heat capacity of air / kg to g Heat capacity of air in typical room conditions= 0.24 cal g× ℃ 1 kg=1,000 g Hint: this is a type of problem that is easier to solve by thinking in terms of units. The question is “how much warmer”, so what type of units do you expect for your answer? How can you arrange the numbers and units given by the problem to cancel out all the units except the one you want in your answer? 300,000 / (0.24*100,000) = 12.5 ℃ 3) Fill out the table below. Given the temperature of these air parcels, use the table that you have in the slides to determine their saturation mixing ratio. Subsequently, use the provided actual mixing ratio to determine the relative humidity. Keep two decimal figures for both the saturation mixing ratio and the relative humidity. (2.5 points) Temperature (°C) Saturation mixing ratio (g/kg) Actual mixing ratio (g/kg) Relative Humidity (%) 14 10.14 5 49.31 14 10.14 9 88.76 24 19.21 5 26.03 2

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