PADI Exam Questions And Correct Answers
(Verified Answers) 2026/2027
normal full pressure of recreational scuba tank
200 bar/ 3000 psi (15 psi per bar)
scuba tank
-80 cf most common
-compressed ambient air
parts of regulator
-1st stage: reduces air from tank to 140 psi
-2nd stage: reduces air to ambient pressure
-"balanced": constant 140 psi
-"failsafe": free flow
atmospheric pressure
-the measurable weight of air exerts 14.7 psi of pressure at sea level
-or commonly recognized as 1 atmosphere of pressure
-pressure increases as we descend underwater
gauge pressure
-14.7 psi at sea level - depth gauges are calibrated to read 0
-approx. every 33 sw and 34 fw the pressure increases by an additional atmosphere
absolute pressure
total pressure exerted on the diver: combination of atmospheric and gauge pressure
Boyle's Law
air bubbles compress as we go down and expand as we go up
-(depth, pressure)
-as diver rises to the surface, the water pressure on body decreases
barotrauma of ear
(Verified Answers) 2026/2027
normal full pressure of recreational scuba tank
200 bar/ 3000 psi (15 psi per bar)
scuba tank
-80 cf most common
-compressed ambient air
parts of regulator
-1st stage: reduces air from tank to 140 psi
-2nd stage: reduces air to ambient pressure
-"balanced": constant 140 psi
-"failsafe": free flow
atmospheric pressure
-the measurable weight of air exerts 14.7 psi of pressure at sea level
-or commonly recognized as 1 atmosphere of pressure
-pressure increases as we descend underwater
gauge pressure
-14.7 psi at sea level - depth gauges are calibrated to read 0
-approx. every 33 sw and 34 fw the pressure increases by an additional atmosphere
absolute pressure
total pressure exerted on the diver: combination of atmospheric and gauge pressure
Boyle's Law
air bubbles compress as we go down and expand as we go up
-(depth, pressure)
-as diver rises to the surface, the water pressure on body decreases
barotrauma of ear
