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, con-
serving 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.
1
, Why don't you feel air pressure? - ANSWER Your body is primarily liquid, which is incom-
pressible 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 dif-
ferent 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
4 bar is what depth? - ANSWER 99ft/30m
How is air volume affected when depth is increased? - ANSWER It decreases
How is air density affected when depth is increased? - ANSWER It increases
What happens if you take an air volume underwater with you in a flexible container or in-
verted jar? - ANSWER As pressure increases the volume decreases, same air but smaller
space.
How do you maintain air volume as you descend? - ANSWER Equalize
2
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, con-
serving 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.
1
, Why don't you feel air pressure? - ANSWER Your body is primarily liquid, which is incom-
pressible 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 dif-
ferent 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
4 bar is what depth? - ANSWER 99ft/30m
How is air volume affected when depth is increased? - ANSWER It decreases
How is air density affected when depth is increased? - ANSWER It increases
What happens if you take an air volume underwater with you in a flexible container or in-
verted jar? - ANSWER As pressure increases the volume decreases, same air but smaller
space.
How do you maintain air volume as you descend? - ANSWER Equalize
2
