EFFECT OF HEAT ON VOLUME 



59 



7. Why is it necessary in indicating the exact length of the standard 

 meter to mention the temperature of the standard (38)? 



8. Give a reason for the space left between the ends of rails on 

 railroads. 



9. Stoppers sometimes become so firmly fixed in bottles that it is 

 impossible to loosen them with the hands. Can you suggest a method 

 of loosening them based on what you have 



learned in this lesson? 



10. Given a liter of water at a temperature 

 of 50. Will it take up more or less space if 

 heated to a temperature of 90? 



11. Would heating have any effect on the 

 total weight of water? 



12. Would a cupful of water at 50 weigh 

 as much as or more than a cupful of water 

 heated to 90? 



13. How do you think a cubic foot of air 

 at zero would compare in weight with a 

 cubic foot of air when the mercury stands 

 at 100? 



14. Would you expect to get a pound of 

 water from a pound of ice? 



FIG. 21 Wire gauze 

 placed under glass flask 

 when heating it. 



15. Why may test-tubes, beakers and the like, made of thin glass, 

 be heated without breaking, when fruit jars and tumblers cannot? 



16. Would fruit jars be as likely to crack when hot liquids are put 

 into them if the jars were slowly warmed to the temperature of the liquids 

 first? Why? 



17. From what you know of heat and its effects do you think cold is 

 a form of energy or merely the absence of heat? 



