316 TEMPERATURE. 



(4.) A liter of air is measured at C. and 760 mm. What volume 

 will it occupy at 740 mm., and 15.5 C. ? 



+ 



740 760 : l > m '' *' V X = 1085 ' 34 cu ' cm ' 



EXERCISES. . , , 



1. A rubber balloon, capacity of 1 liter, contains 900 cu. cm. of 

 oxygen at C. When heated to 30 C., what will be the volume 

 of the oxygen ? Am. 998.9 cu. cm. 



2. If 170 volumes of carbonic acid gas be measured at 10 C., what 

 will be the volume when the temperature sinks to C. ? 



3. A certain weight of air measures a liter at C. How much 

 will the air expand on being heated to 100 C. ? 



4. A gas has its temperature raised from 15 C. to 50 C. At the 

 latter temperature it measures 15 liters. What was its original 

 volume ? 



5. A gas measures 98 cu. in. at 185 F. What will it measure at 

 10 C. under the same pressure ? 



6. To what volume will a liter of gas contract in cooling from 

 42 F. to 32 F. ? Ans. 980 cu. cm. 



7. A certain quantity of gas measures 155 cu. cm. at 10 C., and 

 under a barometric pressure of 530 mm. What will be the volume 

 at 18.7 C., and under a barometric pressure of 590 mm.1 



8. A gallon of air (231 cu. in.} is heated, under constant pressure, 

 from C. to 60 C. What was the volume of the air at the latter 

 temperature ? 



9. A fire balloon contains 20 cu. ft. of air. The temperature of 

 the atmosphere being 15 C., and that of the heated air in the bal- 

 loon being 75 C. , what weight, including the balloon, may be thus 

 supported? (See Appendix G.) 



10. The difference between the temperatures of two bodies is 

 36 F. Express the difference in centigrade degrees. 



11. The difference between the temperatures of two bodies is 

 35 C. Express the difference in Fahrenheit degrees. 



12. (a.) Express the temperature 68 F. in the centigrade scale. 

 (&.) Express the temperature 20 3 C. in the Fahrenheit scale. 



13. What will be the tension at 30 C. of a quantity of gas which 

 at C. has a tension of a million dynes per sq. cm., the volume 

 remaining the same ? ( 69.) Ans. 1109800 dynes. 



14. A liter of gas under a pressure of 1013600 dynes per sq. cm. 

 is allowed to expand until the pressure is reduced to 1000000 dynes 

 per sq. cm. At the same time, the temperature is raised from C 

 to 100 C. Find the final volume. A ns. 1385 cu. cm. nearly. 



