SCUBA - Correct AnswerSelf contained underwater breathing apparatus
What is the pressure change for each 10m/33ft of depth change? - Correct Answer1
bar/1 ata/1 atmosphere
What is the relationship between my depth in water and the pressure? - Correct
AnswerThe 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? -
Correct AnswerAs 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? - Correct AnswerVolume will be 1/ata#
Density will be ata#
What 3 major body air spaces does increasing pressure affect as I descend? - Correct
AnswerEars, sinuses, mask
What is a "squeeze"? - Correct AnswerThe discomfort caused by pressure imbalance
pulling tissue into the air space
What is "equalization"? - Correct AnswerThe addition of air to your air spaces as you
descend
How do I equalize as I descend? - Correct AnswerFor 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? - Correct AnswerEvery meter/few feet, BEFORE you feel
discomfort
What should I do if I can't equalize? - Correct AnswerStop 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? - Correct
AnswerFluid can rupture the eardrum
Bruising around the face can occur
Why does a congestion from a cold or allergy temporarily keep me from diving? -
Correct AnswerCongestion might block normal air flow, making equalization difficult or
impossible
Why should I never dive with earplugs? - Correct AnswerThey create air spaces that
you can't equalize
, What other body air spaces are affected by increasing pressure? How do I equalize
them? - Correct AnswerIn filled teeth - go to a dentist
In a dry suit - learn from an instructor
Lungs - breathe normally and continuously
What is the most important rule in scuba diving? - Correct AnswerBreathe continuously
and never hold your breath
What can happen if I don't follow the most important rule in scuba diving? - Correct
AnswerYour lungs will over expand and rupture
What is a "reverse block"? - Correct AnswerWhen expanding air becomes trapped in
your body air spaces as you ascend
What should I do if I feel discomfort in my ears, sinuses, stomach, intestines, or teeth
while ascending? - Correct AnswerStop your ascent and descend a meter/few feet to
reduce discomfort and give trapped air time to work its way out
How does depth affect how long my air supply lasts? - Correct AnswerThe deeper you
are, the more dense air you breathe, and the faster you use the air in your cylinder.
Compared to the surface, air supply lasts 1/#ata as long along with other factors
What's the most efficient way to breathe dense air underwater? - Correct AnswerTake
slow, deep breaths
How do I breathe to reduce anxiety when under stress? - Correct AnswerDo NOT
breathe faster - keep breathing slowly
What are my 4 breathing rules as a scuba diver? - Correct Answer1. Breathe
continuously and never hold your breath
2. Breathe slowly and deeply
3. Don't allow yourself to get winded or out of breath
4. If faced with a problem, stop, and reduce anxiety by breathing slowly and deeply
What is buoyancy? - Correct AnswerAn upward force acting on an object in the water,
canceling the pull of gravity
What causes buoyancy? - Correct AnswerThe upwards force is caused by the water
displaced by the object, and is equal to the weight of displaced water
positive buoyancy - Correct AnswerThe object weighs less than the water it displaces,
so it floats
neutral buoyancy - Correct AnswerThe object weighs the same as the water it
displaces, neither sinking nor floating
What is the pressure change for each 10m/33ft of depth change? - Correct Answer1
bar/1 ata/1 atmosphere
What is the relationship between my depth in water and the pressure? - Correct
AnswerThe 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? -
Correct AnswerAs 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? - Correct AnswerVolume will be 1/ata#
Density will be ata#
What 3 major body air spaces does increasing pressure affect as I descend? - Correct
AnswerEars, sinuses, mask
What is a "squeeze"? - Correct AnswerThe discomfort caused by pressure imbalance
pulling tissue into the air space
What is "equalization"? - Correct AnswerThe addition of air to your air spaces as you
descend
How do I equalize as I descend? - Correct AnswerFor 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? - Correct AnswerEvery meter/few feet, BEFORE you feel
discomfort
What should I do if I can't equalize? - Correct AnswerStop 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? - Correct
AnswerFluid can rupture the eardrum
Bruising around the face can occur
Why does a congestion from a cold or allergy temporarily keep me from diving? -
Correct AnswerCongestion might block normal air flow, making equalization difficult or
impossible
Why should I never dive with earplugs? - Correct AnswerThey create air spaces that
you can't equalize
, What other body air spaces are affected by increasing pressure? How do I equalize
them? - Correct AnswerIn filled teeth - go to a dentist
In a dry suit - learn from an instructor
Lungs - breathe normally and continuously
What is the most important rule in scuba diving? - Correct AnswerBreathe continuously
and never hold your breath
What can happen if I don't follow the most important rule in scuba diving? - Correct
AnswerYour lungs will over expand and rupture
What is a "reverse block"? - Correct AnswerWhen expanding air becomes trapped in
your body air spaces as you ascend
What should I do if I feel discomfort in my ears, sinuses, stomach, intestines, or teeth
while ascending? - Correct AnswerStop your ascent and descend a meter/few feet to
reduce discomfort and give trapped air time to work its way out
How does depth affect how long my air supply lasts? - Correct AnswerThe deeper you
are, the more dense air you breathe, and the faster you use the air in your cylinder.
Compared to the surface, air supply lasts 1/#ata as long along with other factors
What's the most efficient way to breathe dense air underwater? - Correct AnswerTake
slow, deep breaths
How do I breathe to reduce anxiety when under stress? - Correct AnswerDo NOT
breathe faster - keep breathing slowly
What are my 4 breathing rules as a scuba diver? - Correct Answer1. Breathe
continuously and never hold your breath
2. Breathe slowly and deeply
3. Don't allow yourself to get winded or out of breath
4. If faced with a problem, stop, and reduce anxiety by breathing slowly and deeply
What is buoyancy? - Correct AnswerAn upward force acting on an object in the water,
canceling the pull of gravity
What causes buoyancy? - Correct AnswerThe upwards force is caused by the water
displaced by the object, and is equal to the weight of displaced water
positive buoyancy - Correct AnswerThe object weighs less than the water it displaces,
so it floats
neutral buoyancy - Correct AnswerThe object weighs the same as the water it
displaces, neither sinking nor floating
