PADI Open Water Diver Certification Exam – Q & A

SCUBA - Answer-Self contained underwater breathing apparatus What is the pressure change for each 10m/33ft of depth change? - Answer-1 bar/1 ata/1 atmosphere What is the relationship between my depth in water and the pressure? - Answer-The deeper you go in water, the more the pressure increases Pressure is expressed as the weight of air What is the relationship between pressure, and the volume and the density of air? - Answer-As pressure increases, the gas volume decreases and the gas density increases If I take a volume of air from one depth to another depth, how much will the volume and density change? - Answer-Volume will be 1/ata# Density will be ata# What 3 major body air spaces does increasing pressure affect as I descend? - Answer-Ears, sinuses, mask What is a "squeeze"? - Answer-The discomfort caused by pressure imbalance pulling tissue into the air space What is "equalization"? - Answer-The addition of air to your air spaces as you descend How do I equalize as I descend? - Answer-For ears and sinuses, pinch your nose and blow gently, or wiggle your jaw and swallow For mask, blow into it with nose How often should I equalize? - Answer-Every meter/few feet, BEFORE you feel discomfort What should I do if I can't equalize? - Answer-Stop your descent, signal problem and point to your ear, ascend a bit, and try again What can happen if I don't or can't equalize gently and keep descending? - Answer-Fluid can rupture the eardrum Bruising around the face can occur