PADI Open Water Diver Certification
1. SCUBA: Self contained underwater breathing apparatus
2. What is the pressure change for each 10m/33ft of depth change?: 1
bar/1 ata/1 atmosphere
3. What is the relationship between my depth in water and the pressure?:
The deeper you go in water, the more the pressure increases
Pressure is expressed as the weight of air
4. What is the relationship between pressure, and the volume and the
density of air?: As pressure increases, the gas volume decreases and the
gas density increases
5. If I take a volume of air from one depth to another depth, how much will
the volume and density change?: Volume will be 1/ata#
Density will be ata#
6. What 3 major body air spaces does increasing pressure affect as I
,de- scend?: Ears, sinuses, mask
7. What is a "squeeze"?: The discomfort caused by pressure imbalance
pulling tissue into the air space
8. What is "equalization"?: The addition of air to your air spaces as you
descend
9. How do I equalize as I descend?: For ears and sinuses, pinch your
nose and blow gently, or wiggle your jaw and swallow
For mask, blow into it with nose
10.How often should I equalize?: Every meter/few feet, BEFORE you feel
discom- fort
11.What should I do if I can't equalize?: Stop your descent, signal
problem and point to your ear, ascend a bit, and try again
12. What can happen if I don't or can't equalize gently and keep
descending?-
: Fluid can rupture the
,eardrum Bruising around the
face can occur
13.Why does a congestion from a cold or allergy temporarily keep me
from diving?: Congestion might block normal air flow, making
equalization difficult or impossible
14.Why should I never dive with earplugs?: They create air spaces that
you can't equalize
15.What other body air spaces are affected by increasing pressure? How
do I equalize them?: In filled teeth - go to a dentist
In a dry suit - learn from an
instructor Lungs - breathe normally
and continuously
16.What is the most important rule in scuba diving?: Breathe continuously
and never hold your breath
, 17. What can happen if I don't follow the most important rule in scuba
diving?-
: Your lungs will over expand and rupture
18.What is a "reverse block"?: When expanding air becomes trapped in
your body air spaces as you ascend
19.What should I do if I feel discomfort in my ears, sinuses, stomach, in-
testines, or teeth while ascending?: Stop your ascent and descend a
meter/few feet to reduce discomfort and give trapped air time to work
its way out
20.How does depth affect how long my air supply lasts?: The 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
21.What's the most efficient way to breathe dense air underwater?: Take
slow, deep breaths
1. SCUBA: Self contained underwater breathing apparatus
2. What is the pressure change for each 10m/33ft of depth change?: 1
bar/1 ata/1 atmosphere
3. What is the relationship between my depth in water and the pressure?:
The deeper you go in water, the more the pressure increases
Pressure is expressed as the weight of air
4. What is the relationship between pressure, and the volume and the
density of air?: As pressure increases, the gas volume decreases and the
gas density increases
5. If I take a volume of air from one depth to another depth, how much will
the volume and density change?: Volume will be 1/ata#
Density will be ata#
6. What 3 major body air spaces does increasing pressure affect as I
,de- scend?: Ears, sinuses, mask
7. What is a "squeeze"?: The discomfort caused by pressure imbalance
pulling tissue into the air space
8. What is "equalization"?: The addition of air to your air spaces as you
descend
9. How do I equalize as I descend?: For ears and sinuses, pinch your
nose and blow gently, or wiggle your jaw and swallow
For mask, blow into it with nose
10.How often should I equalize?: Every meter/few feet, BEFORE you feel
discom- fort
11.What should I do if I can't equalize?: Stop your descent, signal
problem and point to your ear, ascend a bit, and try again
12. What can happen if I don't or can't equalize gently and keep
descending?-
: Fluid can rupture the
,eardrum Bruising around the
face can occur
13.Why does a congestion from a cold or allergy temporarily keep me
from diving?: Congestion might block normal air flow, making
equalization difficult or impossible
14.Why should I never dive with earplugs?: They create air spaces that
you can't equalize
15.What other body air spaces are affected by increasing pressure? How
do I equalize them?: In filled teeth - go to a dentist
In a dry suit - learn from an
instructor Lungs - breathe normally
and continuously
16.What is the most important rule in scuba diving?: Breathe continuously
and never hold your breath
, 17. What can happen if I don't follow the most important rule in scuba
diving?-
: Your lungs will over expand and rupture
18.What is a "reverse block"?: When expanding air becomes trapped in
your body air spaces as you ascend
19.What should I do if I feel discomfort in my ears, sinuses, stomach, in-
testines, or teeth while ascending?: Stop your ascent and descend a
meter/few feet to reduce discomfort and give trapped air time to work
its way out
20.How does depth affect how long my air supply lasts?: The 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
21.What's the most efficient way to breathe dense air underwater?: Take
slow, deep breaths
