PADI Open Water Exam Study Guide with Complete Solutions

When is an object positively buoyant? - ANSWER-When it displaces a volume of water weighing more than its own weight. When is an object negatively buoyant? - ANSWER-When it displaces a volume of water weighing less than its own weight. When is an object neutrally buoyant? - ANSWER-When it displaces a volume of water weighing the same as its own weight. Why two pieces of equipment do you use to control your buoyancy? - ANSWER-BCD, Lead weight What does buoyancy help with when you are underwater? - ANSWER-Controlling where you are What does buoyancy help with when you are at the surface? - ANSWER-Floatation, conserving energy How does the buoyancy of an object differ in fresh/salt water? - ANSWER-More buoyant in salt than fresh When you exhale what happens? - ANSWER-Lung volume decreases so you have less buoyancy. When you inhale what happens? - ANSWER-Lung volume increases so you have more buoyancy. Why don't you feel air pressure? - ANSWER-Your body is primarily liquid, which is incompressible and distribute pressure equally throughout your whole body. Where are some air spaces located in the body? - ANSWER-Ears, sinuses, lungs Do you always feel the pressure in body air spaces? - ANSWER-Only if the pressure is different inside and outside the air spaces. 1 bar is what depth? - ANSWER-0m/0ft 2 bar is what depth? - ANSWER-33ft/10m 3 bar is what depth? - ANSWER-66ft/20m