8-10. Charles' Law states that if the volume of 

 an enclosed gas remains constant, the 

 pressure is then directly proportional to 

 the absolute temperature. Therefore, if 

 the absolute temperature is doubled the 

 pressure will be 



1. decreased 



2. doubled 



3. halved 



4. quartered 



8-11. Which law gives the same information as 

 Charles' Law and Boyle's Law? 



1. Pascal's Law 



2. Bernoulli's Theorem 



3. Equation of State 



4. Kenetic Theory of Gases 



Learning Objective: Identify the 

 characteristics of moisture and 

 solve related humidity and heat 

 measurement problems. 



8-12. Which of the following actions will cause 

 the water vapor in a closed container of 

 saturated air to condense? 



1. Reducing the pressure on the mixture 



2. Reducing the temperature of the 

 mixture 



3. Increasing the pressure on the mixture 



4. Increasing the temperature of the 

 mixture 



8-13. Assume that a closed container holds a 

 mixture of four gases. If the partial 

 pressures of the individual gases are 

 3 cm, 14 cm, 26 cm, and 51 cm of mercury 

 respectively, what is the total pressure 

 in the box? 



1. 23.5 cm 



2. 47.0 cm 



3. 51.0 cm 



4. 94.0 cm 



8-14. At a temperature of 20° C, saturated air 

 contains 17.3 grams of water vapor per 

 cubic meter. Assume that a parcel of air 

 contains 8.65 grams of water per cubic 

 meter at 20° C. What is the percent of 

 saturation of this parcel of air? 



1. 10 percent 



2. 30 percent 



3. 50 percent 



4. 80 percent 



_ In items 8-15 through 8-20, assume there 

 are 785 grams of dry air at 25° C and 

 1,000 mb pressure in a container having a volume 

 of 1 cubic meter. Also assume that 16.1 grams 

 of water vapor at the same temperature are put 

 into the container. 



8-15. What is the relative humidity of the 



final mixture of air and water vapor in 

 the container? 



1. 30 percent 



2. 40 percent 



3. 60 percent 



4. 70 percent 



8-16. The absolute humidity of the final mix- 

 ture of air and water vapor in the 

 container is 



1. 6.95 grams per cubic meter 



2. 16.1 grams per cubic meter 



3. 23.05 grams per cubic meter 



4. 39.15 grams per cubic meter 



8-17. If an additional 20 grams of water vapor 

 were added to the existing mixture of 

 air and water vapor, what would be the 

 absolute humidity in the container? 



1. 3.9 grams per cubic meter 



2. 16.1 grams per cubic meter 



3. 23.05 grams per cubic meter 



4. 36.1 grams per cubic meter 



8-18. What is the specific humidity of the 



final mixture of air and water vapor in 

 the container as given in the preceding 

 item? 



1. 0.0201 grams per gram 



2. 0.0285 grams per gram 



3. 1.08 grams per gram 



4. 35.06 grams per gram 



8-19. The mixing ratio of the final mixture of 

 air and water vapor as given in the 

 original information is 



1. 0.0205 grams per gram 



2. 0.161 grams per gram 



3. 39.15 grams per gram 



4. 785.0 grams per gram 



8-20. What is the approximate saturation mixing 

 ratio of this original mixture? 



1. 3 



2. 30 



3. 230 



4. 3,300 



Learning Objective: Identify types 

 of latent heat and the character- 

 istics of matter as it changes from 

 one state to another. 



46 



