PADI Open Water Exam Study Guide Graded A+

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/0ft2 bar is what depth? - Answer-33ft/10m 3 bar is what depth? - Answer-66ft/20m 4 bar is what depth? - Answer-99ft/30m