THE MEASUREMENT OF GASES. MOLECULAR HYPOTHESIS 49 



7. What change in volume would occur if 1 liter of gas at 200 

 were cooled to 0. 



8. Reduce 260 c.c. of gas at 10 and 742 mm. to standard 

 conditions. 



9. Reduce 35 c.c. of gas standing over water at 21 and 732 mm. 

 to dry gas under standard conditions. 



10. Give the feature of the molecular hypothesis which corre- 

 sponds to each of the following facts about gases: 



(a) A specimen of gas can be compressed to l/2000th of the 



volume it occupies at 760 mm. 



(b) A gas, even if heavier than air, gradually leaves an open 



cylinder. 



(c) A specimen of a gas exercises pressure equally in all 



directions. 



(d) Crowding the specimen of gas into one-third of its 



original volume triples its pressure. 



(e) When the temperature is raised, the pressure of a speci- 



men of gas increases (if the volume remains un- 

 changed). 



11. When we drink lemonade through a straw, what causes the 

 liquid to flow up into our mouths? 



