182 GENERAL SCIENCE 



QUESTIONS 



1. What is foul air? 



2. How does it affect life? 



3. Why should people sleep with their windows open? 



4. What do miners call carbon dioxide? 



5. What are the effects of breathing small quantities and large 

 quantities of carbon dioxide? 



6. What are some of the fallacies regarding ventilation? 



7. What system of ventilation has your school? 



8. What is necessary for satisfactory ventilation of public build- 

 ings? 



9. How may drafts be avoided in ventilating a room? 



10. Why does sleeping out-of-doors benefit a person? 



11. Why do some people consider night air unhealthy? 



12. What kinds of lights do you use in your home? How many 

 people would be required to vitiate the same amount of air? 



13. How is one able to tell when the air in a room is bad? 



14. What is the best way of airing out a room? 



15. In what position must the " inlet " and " outlet " of a venti- 

 lating system be placed to get the proper kind of ventilation? 



16. Draw a diagram of the ventilating system of your school. 

 (Special report.) 



17. Why does a white, crusty skin form on the top of a jar of 

 lime water left open in a room? 



18. Test your lungs with the exhaling bottle for the amount of 

 air you breathe out. Described on page 172. 



19. Count the number of times you breathe each minute. 



20. How many cubic feet of air do you exhale in one hour? 



21. Expired air contains about 4 per cent, and fresh air about 

 0.03 per cent, of CO2. Find the amount of CO2 in the air exhaled. 

 Divide the amount of carbon dioxide in tenths of cubic feet exhaled 

 in one hour by 0.0003. Why will this give you the number of cubic 

 feet of air required per hour? 



22. Find the size of your school room. 



23. How many cubic feet of air space are allowed for each pupil? 



24. How many cubic feet of air space are allowed in your living 

 room for each person (count in the lights)? In your sleeping room? 



