TRANSFER OF HEAT 25 



9. Will water at 70 F. feel warm or cold? Why ? 



10. What is the structure of a fireless cooker? Of 

 a thermos bottle? 



11. How do you account for the fact that a thermos 

 bottle may be used to keep a liquid either hot or cold? 



12. Why do we wear woolen clothing in the winter 

 and cotton clothing in the summer? 



13. On cold nights in early fall or late spring, plants 

 are sometimes covered with paper. Why does this keep 

 them from freezing? 



14. How does heat travel through a substance by 

 conduction? 



15. What is meant by convection? 



16. Explain how the water in a tea kettle becomes 

 heated throughout. 



17. Is the air near the ceiling of a room warmer or 

 cooler than that near the floor? Why? 



18. How is heat transferred from a stove or a 

 radiator to all parts of a room? 



19. How is any body cooled? By what means is this 

 usually done ? 



