Padi Open Water Complete Solution

Padi Open Water Complete Solution What is the most important rule of scuba diving? - Do not hold your breath Breathe continuously What are the consequences of breaking the most important rule in scuba diving? - Lung over expansion severe injuries, death What is a reverse block? - pain and discomfort caused by expanding air trapped inside an air space during ascent What should you do if you feel discomfort during ascent due to air expansion in the ears, sinuses, stomach, intestines, or teeth? - slow or stop ascent descend a metre/few feet and give the trapped air time to work its way out How does increasing depth affect how long your air supply lasts? - the deeper you descend, the denser the air becomes. It takes 4X the effort to breathe twice as fast What's the most efficient way to breathe dense air underwater? - take deep, slow breaths Why does a diver need a mask? - creates an air space, so your eyes can focus As you go deeper, you consume air from your scuba cylinder _____ - faster Why does the mask need to enclose your nose? - to equalize during your descent to prevent mask squeeze What 6 features should you look for in a mask? - 1) tempered glass 2) comfortable skirt with a good seal 3) nose or finger pockets 4) low profile 5) Adjustable strap that can be locked in place 6) wide field of vision When buying a mask, what are the 2 most important features? - fit and comfort How do you prepare a new mask for use? - use a soft cloth with a low abrasion cleaner to remove the protective chemical adjust the strap What 3 general maintenance procedures apply to mask care? - 1) rinse thoroughly with fresh H2o 2) keep out of direct sunlight 3) store in a cool, dry place Why does a diver need a snorkel? - 1) lets you rest or swim with your face in the water, without wasting cylinder air 2) makes it easier to breathe when the surface is rough 3) makes it easier to swim back, when you are running low on air What 3 features does an easy-breathing snorkel have? - 1) large diameter (bore) 2) Not excessively long 3) Designed with smooth, rounded bends How do you prepare a snorkel for use? - 1) attach it to the left of your mask 2) Adjust snorkel keeper, so the top of the snorkel sits at the crown of your head with the mouthpiece in place 3) remains in your mouth with a relaxed jaw Why does a diver need fins? - provide a large surface area, so leg muscles can move through the water What are the 2 basic fin styles? - 1) adjustable strap - open heel 2) full-foot What blade design features may enhance a fin's performance? - Ribs- add rigidity, act as vertical stabilizers Vents- reduce resistance to fin and increase efficiency channels- increase efficiency by guiding water smoothly split- designed to thrust water straight back for max efficiency How do you prepare new fins for use? - full foot- no preparation adjustable strap- need to adjust What 3 considerations do you have when buying a specific type of fin? - size physical ability where you plan to dive Why does a diver need a BCD? - allows you to regulate your buoyancy underwater provides positive buoyancy for resting Why do divers need a back pack? - to hold the cylinder Of the 3 styles of BCD, which is the most commonly used by recreational divers? - jacket style What 5 features do BCDs have in common? - 1) enough air 2) large diameter inflation/deflation hose 3) low pressure inflation system 4) over pressure relief valve 5) adjustable to fit comfortably How do you prepare a BCD for use? - adjustment for proper fit is required With it deflated, adjust the straps Put it on, have someone help fine tune it Inflate it What additional maintenance requirements do you have with a BCD? - rinse interior with fresh water store partially inflated Why does a diver need a scuba cylinder? - used to safely store high pressure air What does a cylinder valve do? - control air flow from the cylinder With what piece of equipment is the backpack integrated? - cylinder What are 4 common sizes and 2 materials for scuba cylinders? - 8, 10, 12, 15 liters aluminum and steel What 5 common markings do you commonly find on the neck of a scuba cylinder? - 1) type of material cylinder is made of 2) max pressure permitted in cylinder 3) serial number 4) dates of pressure tests 5) manufacturer symbol What are 2 basic types of cylinder valves? - K-valve: simple on and off J-valve: built in mechanism that signals when you run low on air What's the difference between a DIN valve and a Yoke valve? - DIN: screw the regulator into the valve Yoke: most common, attach regulator via Yoke What is the purpose of a burst disc? - relieve the cylinder over pressurization which can happen from overfilling the cylinder or excess heat