Open Water Test Flashcards
Water is ____x more dense than air.
800
Light travels ____ in water.
Slower
‘1 Atmosphere’ is roughly ____ psi.
14.7
Every ____ you descend into water, you add 1 Atmosphere of pressure.
33.
A cubic foot of seawater weighs about ____ lbs.
64
Sound travels ____ times as fast in water.
4x
The clarity of water is referred to as ____. It can be dirt, plankton, or salt.
Turbidity.
When submerged you are always doing one of these 3 things.
Floating, Sinking, or being neutral with the water.
Because of pressure, your wetsuit becomes neutrally buoyant at about ____ ft.
20ft
Visibly, objects in water appear ____ and ____.
Larger and closer
When going from freshwater to salt water, you should usually ____ weight.
Add.
Normal air is about __% Nitrogen and __% Oxygen and other gases.
79,21.
Nitrox is ____ enriched air, and allows you to dive ____.
Oxygen, Longer (NOT DEEPER)
The warmer a scuba tank is, the ____ the pressure will be inside the tank.
More.
What does ‘AGE’ stand for?
Arterial Gas Embolism
‘Martini’s Law’ is technically known as ____
Nitrogen Narcosis
Your Ascent Rate should be less than ____ fpm.
<30 feet per minute
Should you ascend faster than your bubbles?
NO!
Most safety stops for shallow dives are done around ____ ft and for about __ minutes.
15-25 ft, 3 min
SCUBA tanks have to be ____ tested every ____ years per the DOT.
Hydrostatically, 5 years.
What causes ‘Shallow Water Blackout’?
Excessive Hyperventilation
Air with less than ____% O2 will not support life.
10%
The heart works ___ to ___ times harder under water pressure.
1.3-1.5
When using dive tables, make sure to round ____ for depth and time.
UP
What does ‘No impact’ diving mean.
Diving to leave the location as if you were never there. Being just a spectator.
What is a Thermocline?
The border between warmer and colder water.
Strong, dangerous currents found near reefs and dropoffs are referred to as ____ currents.
Rip-currents.
If trying to pass through a rip current, a diver should swim at a(n) ____ degree angle to the current.
90 degree
Always start your dive into the current. Why?
So that when returning and tired you can ride the current back.
Before getting on the boat entirely, what is a very important factor that should be considered about the boat itself?
How divers will be getting back into the boat. Check ladders, ropes, whatever.
What should you do if you get tangled in kelp?
Stop, Relax, and move slow.
