joorev - Club Diver

01. What is the approximate composition of air?

02. What is atmospheric pressure?

03. What, if any, is the relationship between depth and pressure?

04. What is bar pressure at 20m 40m and 45m?

05. What is the depth at 2 bar, 4 bar and 3.5 bar?

06. What is ambient pressure?

07. Explain your understanding of Boyles law?

08. What body spaces may Boyles Law affect?

09. How does Boyle's Law affect the diver?

10. On ascent from approx. 25m, between what depths does the greatest change in volume occur?

11. A balloon occupying a volume of 6L at the surface will occupy what volume at 10m?

12. Explain your understanding of Dalton's Law, and how it could affect the diver?

13. Explain your understanding of Henry's law and how it could affect the diver?

14. Explain your understanding of Charles' Law, and how it could affect the diver?

15. Explain, giving examples, your understanding of the term 'partial pressure' of a gas?

16. Should a full diving cylinder be left out in the sunshine on a hot day? Why?

17. Why would the pressure in an unopened dive cylinder, drop several hours after filling?

18. What happens when a carbonated drink is shaken and then immediately opened? Why?

19. Why is the bubbling of a gas in a liquid relevant to divers?

20. At approximately what partial pressure does oxygen become toxic?

21. Two factors influence the absorption of gas in the body during a dive, what are they?

22. Blood absorbs and releases nitrogen faster than fat. True or false?

23. Why might a RIB's pontoons slightly deflate in the cool of the evening?

24. What is tooth squeeze?

25. What is mask squeeze? How is it alleviated?

26. Why do divers not wear swimming goggles while diving?

27. What happens to light when it passes from air to water?

28. What effect does light passing from air to water have on the diver's vision?

29. Some coloured objects may appear grey at depth. Why is this so, and how can this be resolved by the diver?

30. Does sound travel faster underwater or on land?

31. Is it easy for a diver to determine distance and direction of sound underwater?

32. Do different body tissues absorb gases at the same rate? Explain your answer

33. What is your understanding of Archimedes Principle?

34. What is positive, negative and neutral buoyancy?

35. What is the ideal state of buoyancy for a diver?

36. Why does a diver wear weights?

37. What factors cause a reduction in buoyancy in a diver?

38. How does a diver compensate for this on descent?

39. What can happen if a diver experiences dramatic loss of buoyancy during a dive?

40. What should a diver do to recover from dramatic buoyancy loss?

41. What can happen if a diver experiences dramatic gain in buoyancy during a dive?

42. What should a diver do to recover from dramatic buoyancy gain

43. What effect does increased depth have on the wet-suited diver?

44. In freshwater, will the diver wear more or less weight than in the sea? Explain your answer.

45. Briefly explain the causes, signs/symptoms of nitrogen narcosis

46. Briefly explain the treatment and prevention of nitrogen narcosis

47. Divers of many years' experience never get narcosis. True or false?

48. Compared to breathing rates at the surface, to what extent does air consumption at 30 m increase?