150 GENERAL SCIENCE 



2. Calculate the values in centigrade readings of (a) 77F.; (b) 59 F.; (c) 



212 F.; (d) 140 F. 



3. Calculate the values in Fahrenheit degrees of (a) 100 C.; (b) 30 C. 



4. At what temperature does mercury (a) boil; (b) freeze? For very low 

 temperatures, as in the polar regions, what liquid is used in place of mer- 

 cury for thermometers? 



5. State what scientists believe true concerning (a) the nature of heat in 

 bodies; (b) the cause of differences in the temperature of bodies. 



6. Distinguish between conduction and convection of heat in matter. 



7. Where heat passes through space destitute of matter, what is the accepted 

 teaching concerning its manner of transmission ? What is the name given 

 the supposed medium that transmits the motion? 



8. What is the distinction in meanings of the terms reflection, transmis- 

 sion, and absorption of heat. 



9. Where light or heat waves fall very obliquely upon a land or water surface, 

 what becomes of the larger portion that evidently is not absorbed since 

 it does not warm them? What is true of the amounts absorbed by land 

 surfaces as compared with water surfaces? 



