Term
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Definition
| when an object displaces more than its own weight |
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Term
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Definition
| when an object displaces less than its own weight |
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Term
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Definition
| when an object displaces water equal to its own weight |
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Term
| at 33ft/10m how much pressure is there (in bars), what is the air volume and what is the density? |
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Definition
pressure-2 bars
air volume-1/2
density-x2 |
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Term
| at 66ft/20m how much pressure is there (in bars), what is the air volume and what is the density? |
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Definition
pressure-3 bars
air volume-1/3
density-x3 |
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Term
| at 99ft/30m how much pressure is there (in bars), what is the air volume, and what is the density? |
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Definition
pressure-4bars
air volume-1/4
density-x4 |
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Term
| Why is buoyancy control both on the surface and underwater one of the most important skills you can master? |
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Definition
on the surface: conserve energy while resting and siwmming
underwater:sso that you can tay off the bottom and not harm aquatic life |
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Term
| Would an object be more buoyant in salt or fresh water? |
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Definition
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Term
| which has a greater pressure change when you ascend or descend? air or water? |
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Definition
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Term
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Definition
| a condition that causes pain and discomfort when the pressure inside an air space is less than the pressure outside an air space. |
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Term
| what are three ways that describe a technique used to equalize air spaces during descent |
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Definition
1. block your nose and attempt to gently blow through it.
2. swallow and wiggle the jaw from side to side
3. block your nose and attempt to gently blow through it while swallowing and wiggling the jaw from side to side |
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Term
| how often should you equalize during descent? |
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Definition
| every few feet or when you feel discomfort |
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Term
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Definition
| a condition that occurs when expanding air cannot escape from a body air space during ascent, causing pain and discomfort |
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Term
| what should you do if you feel discomfort during ascent due to air exapansion whether in youe ears, sinuses, stomach, intestines or teeth? |
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Definition
| stop or slow your ascent, descend a few feet and try ascending again |
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Term
| why must your nose be enclosed in your mask? |
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Definition
| to equalize the air pocket your mask creates |
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Term
| best way to prevent water in your scuba cylinder? |
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Definition
| always have some air in it, never let it be completely emptied of air pressure |
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Term
| most important feature when purchasing a regulator |
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Definition
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Term
| underwater objects may look this way to you |
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Definition
| magnified, larger and closer |
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Term
| what travels four times faster in water than in air and makes it hard to determine the origin of |
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Definition
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Term
| what should you do if you start shivering continuously underwater? |
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Definition
| get out of the water, dry off, and seek warmth |
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Term
| what are some preventative mesaure to avoid overexertion? |
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Definition
| move slowly and avoid extended strenuous activity and know your physical limits |
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Term
| what do you do if you become overexerted? (underwater and on surface |
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Definition
underwater-stop, breathe deeply, rest, and hold onto something if possible
on the surface- establish buoyancy and rest |
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Term
| techniques for airway control |
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Definition
1.use your tongue as a splash guard by placing the tip on the roof of your mouth
2.inhale slowly
3. inhale cautiously |
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Term
| most important feature of any weight system |
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Definition
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Term
| alternate air source should be ________, so it can quickly and easily be identified |
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Definition
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Term
| where should you attach an alternate air source to your body? |
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Definition
| triangular area between mouth and lower corners of rib cage |
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Term
| true or false: a diving knife should be used as a tool and not a weapon |
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Definition
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Term
| how can you check for proper weighting |
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Definition
| you should float at eye level with an empty bcd and while having a normal breath |
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Term
| list and describe the steps of the predive safety check |
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Definition
BWARF
B-bcd
W-weights
A-air
R-releases
F-final okay |
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Term
| what factors affect underwater visibiity? |
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Definition
| weather, water movement, and suspended particals |
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Term
| true or false: to avoid problems diving in clear water it is recommended that you use an accurate depth gauge, refer to it frequently and use a line for ascents and descents |
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Definition
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Term
| what should you do if caught in a rip tide on the surface? |
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Definition
| swim perpendicular to the current or establish buoyancy and call for help |
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Term
| true or false: it is easier to swim against a mild current along the bottom where it is generally weaker |
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Definition
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Term
| if a current is present how should you begin your dive? |
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Definition
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Term
| what should you do if you spot an aggressive animal underwater? |
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Definition
| remain still and clam on the bottom and watch. head to bottom and calmly swim awal |
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Term
| a rip current is a line or turbid , foamy water moving in what direction? |
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Definition
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Term
| three ways to prevemt or control most diving problems that occur at the surface |
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Definition
1. dive within limitations
2. relax
3. maintain positive buoyancy |
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Term
| true or flase: the first step in assiting another diver with a problem at the surface is to talk to him |
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Definition
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Term
| when should you use the emergency options and what are they |
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Definition
| 1.buoyant emergency ascent: when your buddy is too far away and youre deeper than 30 ft |
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Term
| true or false: with an unconcious diver, the primary concern is to remove him from the water |
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Definition
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Term
| true or false: once removed from the water, an uncoincious diver should be administered oxygen if available. |
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Definition
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Term
| what are two situations in whih your divers log book would be requested? |
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Definition
| for additional diver training, when diving at resorts or on boat |
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Term
| how can you prevent problems with contaminated air? |
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Definition
| have tanks filled with only pure dry filtered, compressed air from a reputable station |
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Term
| two ways to prevent problems with oxygen |
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Definition
1. never fill a tank with pure oxygen
2. dont have your cylinder filled with enriched air unless you have the proper training and certification |
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Term
| symptoms related to nitrogen narcosis |
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Definition
| impaired coordination and foolish behavior |
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Term
| how to prevent nitrogen narcosis |
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Definition
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Term
| symptoms related to decompression illness |
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Definition
| get the person into medical care, prevent/treat for shock, administer oxygen, and cpr if nessecary |
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Term
| when using the recreational dive planner, you must ascend at what rate? |
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Definition
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Term
| what is the mximum depth for open water divers, divers with training and experience beyong the open water diver level, and maximum depth for divers with deep diver training |
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Definition
open water divers-60ft/18 m
training beyond open water diver-100ft/30m
divers with deep diver training-130ft/40m |
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Term
| how do you find out what the decompression limit for a certain depth is |
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Definition
| activate NDL scroll mode on your computer |
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Term
| what do you do if your computer fails during a dive |
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Definition
| use your backup computer or end the dive and ascend very slowly |
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Term
| unless it is an emergency situation and you must omit it, you should consider the safety stop a routine procedure |
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Definition
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Term
| what should you do if you accidentily exceed your computers no decompression limit |
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Definition
| you should decompress according to your computers decompression mode and not dive for 24 hours |
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Term
| above what altitude must you use a special setting on your dive computer? |
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Definition
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Term
| what is the recommendation for flying after diving |
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Definition
| 12 bours after single dives and 18 hours after repeptitive,multilevel dives |
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Term
| option for cold or strenuous dives? |
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Definition
| you may be able to increase your safety factor on your computer |
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Term
| how do you find out what the decompression limit for a certain depth is |
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Definition
| activate NDL scroll mode on your computer |
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Term
| what do you do if your computer fails during a dive |
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Definition
| use your backup computer or end the dive and ascend very slowly |
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Term
| unless it is an emergency situation and you must omit it, you should consider the safety stop a routine procedure |
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Definition
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Term
| what should you do if you accidentily exceed your computers no decompression limit |
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Definition
| you should decompress according to your computers decompression mode and not dive for 24 hours |
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Term
| above what altitude must you use a special setting on your dive computer? |
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Definition
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Term
| what is the recommendation for flying after diving |
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Definition
| 12 bours after single dives and 18 hours after repeptitive,multilevel dives |
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Term
| option for cold or strenuous dives? |
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Definition
| you may be able to increase your safety factor on your computer |
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