PADI OPEN WATER EXAM QUESTIONS WITH COMPLETE
SOLUTION
Water Pressure
Pressure exerted by water, increases with depth
One Bar
Pressure at sea level, equivalent to one atmosphere (ata)
Air Volume
The amount of space occupied by air
Pressure Increase
Rises by one bar/ata for every 10 meters/33 feet descended
Pressure Decrease
Drops by one bar/ata for every 10 meters/33 feet ascended
Water Density
Measure of mass per volume, remains constant with pressure change
Gas Volume
Space occupied by gas, decreases with pressure increase
Gas Density
Mass of gas per unit volume, increases with pressure
Equalization
Adding air to body air spaces to match outside pressure
Ear Squeeze
Discomfort caused by increasing pressure on the eardrum
Dry Suit
Suit designed to hold a layer of air around the body during the dive
Reverse Block
Trapped expanding air in a body air space
Buoyancy
Upward force acting on an object in water, cancels gravity
BCD
Buoyancy Control Device, adjusts buoyancy by inflating/deflating
Weight System
Equipment to offset positive buoyancy and ensure proper trim
Regulator
Device that delivers breathing air at surrounding pressure
Cylinder
Aluminum or steel container for storing high-pressure air
Enriched Air Nitrox
SOLUTION
Water Pressure
Pressure exerted by water, increases with depth
One Bar
Pressure at sea level, equivalent to one atmosphere (ata)
Air Volume
The amount of space occupied by air
Pressure Increase
Rises by one bar/ata for every 10 meters/33 feet descended
Pressure Decrease
Drops by one bar/ata for every 10 meters/33 feet ascended
Water Density
Measure of mass per volume, remains constant with pressure change
Gas Volume
Space occupied by gas, decreases with pressure increase
Gas Density
Mass of gas per unit volume, increases with pressure
Equalization
Adding air to body air spaces to match outside pressure
Ear Squeeze
Discomfort caused by increasing pressure on the eardrum
Dry Suit
Suit designed to hold a layer of air around the body during the dive
Reverse Block
Trapped expanding air in a body air space
Buoyancy
Upward force acting on an object in water, cancels gravity
BCD
Buoyancy Control Device, adjusts buoyancy by inflating/deflating
Weight System
Equipment to offset positive buoyancy and ensure proper trim
Regulator
Device that delivers breathing air at surrounding pressure
Cylinder
Aluminum or steel container for storing high-pressure air
Enriched Air Nitrox
