Term
| An object is positively buoyant if it ... |
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Definition
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Term
| An object is negatively buoyant if it... |
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Definition
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Term
| An object is positively buoyant if it displaces |
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Definition
| a volume of water MORE than its own weight |
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Term
| What two pieces of equipment do you need to control your buoyancy? |
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Definition
BCD (Buoyancy Control Device)
lead weights |
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Term
| (T/F) Buoyancy control is one of the most important skills you can master because it allows you to control where you are in the water |
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Definition
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Term
| An object will be more buoyant in ____ than it would be in ____ |
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Definition
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Term
| When you exhale, your lung volume decreases. This means you have ____ buoyancy. |
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Definition
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Term
| You usually feel pressure only in ____ |
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Definition
| body air spaces because air is compressible and changes volume with pressure changes. |
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Term
| (T/F) Pressure changes in water for a given ascent or descent are much more substantial than the same distance ascent or descent in air because water weighs more. |
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Definition
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Term
| At 0 ft, pressure = ____ bar/ata |
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Definition
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Term
| You add one ata/bar pressure for every ____ you descend |
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Definition
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Term
| Air expands ____ as you ascend and the pressure ____. |
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Definition
| proportionately, decreases |
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Term
| The three major air spaces affected by pressure when you descend are: |
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Definition
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Term
| A squeeze is a pressure imbalance in which pressure inside/outside an air space exceeds pressure inside/outside an air space, resulting in pain and discomfort. |
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Definition
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Term
| Adding air to an air space as you descend so the pressure in an air space equals the surrounding air pressure is called ___ |
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Definition
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Term
| What are some techniques for equalizing your ears? |
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Definition
1. Pinch your nose and blow gently against it.
2. Swallow and wiggle your jaw from side to side.
3. Swallow and wiggle your jaw from side to side while blowing gently against your pinched nose. |
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Term
| (T/F) You want to equalize your ears when you feel discomfort. |
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Definition
| False: equalize every meter while descending before you feel discomfort. |
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Term
| (T/F) If you feel discomfort and cannot equalize, ascend until you relieve the discomfort and try again. |
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Definition
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Term
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Definition
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Term
| (T/F) If you have equalization problems, you should signal your dive buddy/instructor immediately. |
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Definition
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Term
| The most important rule in scuba diving is ____ |
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Definition
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Term
| (T/F) Ascending while holding your breath can cause lung over expansion injuries. |
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Definition
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Term
| (T/F) Ascending while holding your breath can cause paralysis and death. |
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Definition
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Term
| (T/F) Ascending while holding your breath can cause injuries that are easy to avoid if you do not hold your breath. |
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Definition
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Term
| Pain and discomfort caused by expanding air trapped inside an air space during an ascent is called _____ |
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Definition
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Term
| If you feel discomfort during an ascent due to a reverse block you should ... |
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Definition
| slow or stop the ascent, descend a meter and allow the trapped air time to work its way out |
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Term
| Exhale into your mask through your ____ to prevent a squeeze. |
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Definition
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Term
| (T/F) You should not dive with a cold or allery congestion, even with a decongestant. |
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Definition
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Term
| The deeper your go, the faster/slower you use your air supply. |
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Definition
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Term
| Dense air is easier/harder to inhale than air at normal surface pressure and density. |
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Definition
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Term
| (T/F) You want to take deep, slow breaths while diving. |
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Definition
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