Lab05-06Answers - Solutions to Homework: Exercises for...

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Solutions to Homework: Exercises for Weather and Climate , EES 108: Earth and Atmosphere Due Thurs. Sept. 22 Lab 5, #14 Determine the saturation mixing ratio of the following air samples, and calculate the relative humidity of each. Temp Saturation mixing ratio ( g / kg ) Mixing ratio ( g / kg ) Relative humidity 14 C 10 . 14 5 49% 14 C 10 . 14 9 89% 24 C 19 . 21 5 26% 24 C 19 . 21 2 10% 34 C 35 . 134 7 20% Lab 5, #15 In the winter, cold air is brought into homes and heated. How does this change the relative humidity of the air? Heating the air increases the saturation mixing ratio. Since there is not a lot of liquid water available, the specific humidity does not change much, so the relative humidity becomes lower. That’s why, if you live in a place that gets in the winter, the air in your home tends to feel dry in the winter and your nose and throat can feel dry and scratchy. Lab 5, #16 Explain why the basement of a house often has high relative humidity in the summer. Since hot air rises and cold air sinks, the basement is generally the coldest place in the house. As warm humid air cools and sinks into the basement, the saturation specific humidity drops, but unless the temperature cools to the dew-point, the actual specific humidity does not change, so the relative humidity rises.
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EES 108 Answers to Homework from Lab. 5 6 Due Sept. 22 Lab 5, #17 Rank each of the following air samples from 1 (highest) to 5 (lowest) in order of water vapor content. Temp. Saturation Mixing Ratio RH Actual Mixing Ratio Rank A 14 C 10 . 140 90% 9 . 126 3 B 20 C 14 . 956 60% 8 . 974 4 C 24 C 19 . 210 40% 7 . 684 5 D 30 C 27 . 694 40% 11 . 078 1 E 34 C 35 . 134 30% 10 . 540 2 Lab 5, #18 From the above example, can you suggest one disadvantage of using relative humidity? Relative humidity is good at telling you how close the actual mixing ratio is to the saturation mixing ratio, but it’s not good at telling you how much moisture is in the air (i.e., it’s not good at telling you the actual mixing ratio). We tend to think that greater relative humidity means a greater mixing ratio, but that’s only true if we’re comparing air at the same temperature. If we compare air at different temperatures, as we did in the previous question, a greater relative humidity in cold air
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This note was uploaded on 12/15/2011 for the course EES 108 taught by Professor Giligan during the Spring '11 term at Vanderbilt.

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Lab05-06Answers - Solutions to Homework: Exercises for...

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