Global Marketing > Scuba Diving > Flashcards

Scuba Diving Flashcards

(59 cards)

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1
Q

What is Equalisation

A

The essential process of adding air to the body’s air spaces to match the increasing pressure of the surrounding water as you descend, preventing injuries - pinch and blow your nose.

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2
Q

Dry Suit

A

Holds a layer of air around your body during the dive.

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3
Q

Buoyancy

A

An upwards force acting on an object in water.

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4
Q

Reverse Block

A

results when expanding air becomes trapped in a body air space.

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5
Q

Positive buoyancy

A

If an Object weighs less than water it displaces it and floats

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6
Q

Negative buoyancy

A

If an object weighs more than the water it displaces it sinks.

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7
Q

Neutral Buoyancy

A

If an object weighs the same as the water it displaces, it neither floats nor sinks.

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8
Q

Buddy System

A

The Buddy System is diving with another diver or divers in a team that provides shared assistance and safety benefits.

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9
Q

Flexible Lower portion (Snorkel Component)

A

Allows the snorkel mouthpiece to drop out of the way when not in use.

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10
Q

Self-drain valve (Snorkel Component)

A

Makes it easier to blow water out of the snorkel.

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11
Q

Splash Guard (Snorkel Component)

A

Reduces the amount of water than can splash in during use.

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12
Q

adjustable strap fins

A

Open at the heel and straps hold them in place. You usually wear wet suit boots with adjustable fins.

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13
Q

Full-Foot fins

A

enclose the heel and fit like snug shoes

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14
Q

split fins

A

Fins that have a split down the blade center.

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15
Q

Vented fins

A

fins that let water pass through in key areas to assist performance.

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16
Q

Quick release straps

A

Fins that have quick release buckles that make them eaiser to remove

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17
Q

Spring Straps

A

For adjustable fins, once you get the right size spring straps “auto Adjust” for a proper fit every time and are highly unlikely to wear out.

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18
Q

Buoyancy Control Device (BCD)

A

Holds your kit together and allows you to adjust buoyancy throughout the dive.

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19
Q

Regulator

A

Delivers breathing air at the surrounding pressure when you inhale, and directs exhaled air into the water.

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20
Q

Cylinder

A

Holds the high-pressure breathing air supplied by your regulator during the dive.

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21
Q

weight system

A

Holds lead weight to counteract the positive buoyancy of your body and some of your equipment, with a mechanism for dropping some or all the weight in an emergency.

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22
Q

Sidemount option

A

Wearing at least one, but ususally two cylinders on your sides instead of your back.

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23
Q

Inflatable Bladder

A

This is a very durable bag that you inflate or deflate to change your buoyancy

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24
Q

LPI (Low Pressure Inflator) Mechanism

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A

Usually at the end of a large - diameter hose, the LPI inflates the bladder with air from your cyclinder, via the regulator, when you press a button. Another button allows you to deflate the bladder or inflate it orally.

25
Cylinder Band and Harness/Jacket
The bladder integrates with an adjustable harness that holds the cylinder on your back. The bladder may be entirely behind you, or wrap partially around your waist/ or over your shoulders. With some systems you can interchange harness and bladders to accommodate sizing and preferences
26
Quick Exhaust Valves
To prevent Rupturing the baldder due to overfilling, BCDs have one or more overpressure valves that automatically vent if the BCD is too full. Some may have "quick dump" valves that let manually release air which is sometimes easier (due to your position in the water) thann using the LPI exhaust
27
Pockets and D-rings
Many BCD have pockets for storing and D-rings for attaching accessories.
28
Shoulder Quick release
A quick release buckle on one or both shoulders makes it easier to get out of your kit.
29
Submersible Pressure Gauge (SPG)
Indicates the air pressure remaining int he cylinder so you can manage your air supply (The SPG shows your remaining air pressure in bar (Metric) or PSI (Imperial, Pounds per sqaure inch).
30
Pony Bottles and self -contained bottles
Small Cylinders with their own regulators, so they're completely separate from your main Scuba kit. You can use them yourself or share them with another dover. A self-contained ascent bottle has justenough air to reach the surface and usually attaches to your BCD harness. Pony bottles hold more air, but they're bigger. You Typically strap them to your main cylinder or clip them to BCD D-rings.
31
Yoke or DIN
The Yoke system holds the first stage to the cylinder with a clamp system. With the DIN system, the regulator threads into the valve. The yoke system is older and more widely established.
32
DIVE/Predive Switch
This switch reduces freeflow (air released without control) when the second stage isn't in your mouth.
33
Adjustable Second Stage
A knob allows small air flow adjustments; this option lets you keep the regulator breathing its best over the course of it's maintainence cycle.
34
Cold-water first stage
In cooler climates the first stage can freeze resulting in a freeflow. Special cold-water regulators reduce the likelihood of thsi by surrounding the first stage with a special liquid.
35
Enriched Air Nitrox (EANX)
Air with additional oxygen added to it.
36
Tec Divers
Sport divers who use extensive technology,, and have substantial training and experience, to exceed the accepted limits of recreational diving.
37
Trim
refers to a diver's body orientation or posture in the water specifically maintaining a horizontal, level body position while moving or stationary.
38
Weight belt
Weights that thread onto a nylon belt and belts that include zippered pockets that hold the weights.
39
Hypothermia
Body cools so much it can no longer function properly.
40
five point descent
1. Confirm that your buddies are ready. 2. Orient yourselves to something at the surface or underwater, such as the boat. 3. Switch from your snorkel to your regulator. 4. Check and if necessary activate, your dive computer or timer. If in 'sleep' mode most dive computers self activate when you go underwater, but generally it's best to have them active. 5. Signal "Descend" and, with your buddies, slowly deflate your BCD.
41
thermocline
A distinct, rapidly temperature - changing layer in a body of water that separates warmer surface water from cooler, denser deep water.
42
The Bow
The front of the boat "foreward" means towards the bow.
43
port
The left side of the boat as you face forward.
44
the stern
the back of the boat. "aft" means towards the stern.
45
Starboard
The right side of the boat as you face forward "Port" and "starboard" reduce confusion because they are always relative to the bow.
46
Five Point Ascent
1. Signal "up" and confirm that your buddies are ready. 2. Check your dive computer to be sure you're within its limits. If your not using a computer, check the time for use with dive tables). 3. Look up and hold up your BCD deflator hose. Do not add air to your BCD. If you're properly weighted and neutrally buoyant, you only need to start swimming up gently. 4. Ascend slowly - No faster than your dive computer's maximum rate. The rate is 18 metres/ 60 feet per minute, but most dive computers require a slower rate of 10 metres/ 30 feet per minute. Most dive compouters warn you if you ascend too fast, so use your comoputer to guide your speed. Release air expanding in your BCD to control your buoyancy so you don't start to rise fast. If you're not using aa computer, use your timer and depth gauge to be sure you ascend no faster than 3 metres/ 10 feet each 10 seconds. 5. Look up and turn as you ascend and stay with your buddies. Watch for obstacles overhead. Reach up as you near and break through the surface.
47
Leeward
the side away from the wind. It is often pronounced 'loo-erd'
48
Windard
The side toward the wind
49
The bridge (Wheelhouse)
The portion of the boat where the controls are; often elevated for visibility.
50
Head
The boat's kitchen/cooking area (in some areas, most larger dive boats have galleys; in others, few do).
51
Swim step
A platform on the stern that is close to water level. You commonly enter and exit the water there.
52
Freeflow regulator
A Scuba diving regulator that continuously supplies air, instead of only when the diver inhales
53
Low pressure horns
use air from your cylinder. They are much louder than whistles, they usually attach to the BCD inflator. You probably want a standard whistle, too, to use if your cylinder is empty
54
Inflatable Signal Tubes
brightly coloured plastic/fabric tubes that you inflate at the surface. They stand more than a metre/three feet above the surface, helping make you visible even in rough conditions. They roll up compactly and fit in your pocket when not in use.
55
Mesh utility bags
Is a heavy duty bag made from nylon mesh or other water -resistant synthetic. Think of these as all - purpose containers for bulkly or hard -to -use carry items.
56
Slates and wet books
something to write on to communicate to other divers.
57
Dive lights
Dive lights are designed specifically to be both watertight and to withstand pressure. Use dive lights for night diving.
58
Dive Computers
dive computers and dive tables work by using your dive time and depth information to calculate the theoretical amount of nitrogen in your body.
59
No stop diving
Swimming directly to the surface without unacceptable risk of decompression sickness.
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