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Scuba 1
PADI Open Water Diving Exam Chapt 1
31
Sports
Not Applicable
09/27/2011

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Cards

Term
An object is positively buoyant if it ...
Definition
floats
Term
An object is negatively buoyant if it...
Definition
sinks
Term
An object is positively buoyant if it displaces
Definition
a volume of water MORE than its own weight
Term
What two pieces of equipment do you need to control your buoyancy?
Definition
BCD (Buoyancy Control Device)
lead weights
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
Definition
True
Term
An object will be more buoyant in ____ than it would be in ____
Definition
salt water, fresh water
Term
When you exhale, your lung volume decreases. This means you have ____ buoyancy.
Definition
less
Term
You usually feel pressure only in ____
Definition
body air spaces because air is compressible and changes volume with pressure changes.
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.
Definition
True
Term
At 0 ft, pressure = ____ bar/ata
Definition
1
Term
You add one ata/bar pressure for every ____ you descend
Definition
10 meters/33 feet
Term
Air expands ____ as you ascend and the pressure ____.
Definition
proportionately, decreases
Term
The three major air spaces affected by pressure when you descend are:
Definition
mask, sinus, ears
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.
Definition
outside, inside
Term
Adding air to an air space as you descend so the pressure in an air space equals the surrounding air pressure is called ___
Definition
equalization
Term
What are some techniques for equalizing your ears?
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.
Term
(T/F) You want to equalize your ears when you feel discomfort.
Definition
False: equalize every meter while descending before you feel discomfort.
Term
(T/F) If you feel discomfort and cannot equalize, ascend until you relieve the discomfort and try again.
Definition
True
Term
If you can't equalize...
Definition
abort the dive.
Term
(T/F) If you have equalization problems, you should signal your dive buddy/instructor immediately.
Definition
True
Term
The most important rule in scuba diving is ____
Definition
NEVER hold your breath.
Term
(T/F) Ascending while holding your breath can cause lung over expansion injuries.
Definition
True
Term
(T/F) Ascending while holding your breath can cause paralysis and death.
Definition
True
Term
(T/F) Ascending while holding your breath can cause injuries that are easy to avoid if you do not hold your breath.
Definition
True
Term
Pain and discomfort caused by expanding air trapped inside an air space during an ascent is called _____
Definition
a reverse block.
Term
If you feel discomfort during an ascent due to a reverse block you should ...
Definition
slow or stop the ascent, descend a meter and allow the trapped air time to work its way out
Term
Exhale into your mask through your ____ to prevent a squeeze.
Definition
nose
Term
(T/F) You should not dive with a cold or allery congestion, even with a decongestant.
Definition
True
Term
The deeper your go, the faster/slower you use your air supply.
Definition
faster
Term
Dense air is easier/harder to inhale than air at normal surface pressure and density.
Definition
harder
Term
(T/F) You want to take deep, slow breaths while diving.
Definition
True
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