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Exam (elaborations)

NAUI SCUBA Exam

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  • Course
  • Naui scuba
  • Institution
  • Naui Scuba

Exam of 8 pages for the course naui scuba at naui scuba (NAUI SCUBA Exam)

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  • September 11, 2024
  • 8
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Naui scuba
  • Naui scuba
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leonardmuriithi061
NAUI SCUBA Exam
Underwater basic physics - ANSWER Density of H2O = 800X more dense than air

Being underwater effects:

How we hear sounds
Bodies thermal capabilities aka faster heat loss
Our ability to move

And creates Drag Effect

Need to knows about LIGHT underwater - ANSWER Light is absorbed as depth
increases

Warm colors (Red Orange Yellow Green) fade

Cool colors (Blue Indigo Violet Remain)

Refraction occurs, objects appear 25-33% bigger underwater

Need to knows about SOUND underwater - ANSWER Sound travels 4X faster

Seems Omnidirectional

Difficult if not impossible to tell what direction sound is coming from

Need to knows about HEAT underwater - ANSWER Being underwater conducts
heat away from our bodies 25X faster than on land

Hyperthermia is a potential issue

Needs for thermal protection depend on how much time is spent in the water

A drysuit is the best protection from heat loss

Movement through water - ANSWER Water resists movement, must present
minimum surface area in direction of movement: swim with a proper horizontal trim

Fins must be used as primary mode of transportation

the 3 States of Buoyancy - ANSWER Positive: floating
Negative: Sinking
Neutral: What we want for scuba diving

Inhale to float
Exhale to sink

, *Proper weighting is imperative*

Weight of 1 cubic foot of sea water? Fresh water? - ANSWER Sea Water: 64 lbs
Fresh water: 62.4 lbs

What are Squeezes - ANSWER Air spaces in body and equipment are subject to a
reduction of volume as pressure underwater increases

Squeezes in the body - ANSWER Body air spaces: lungs, middle ear, sinuses,
stomach, intestines, tooth fillings

Squeezes in equipment - ANSWER Equipment air spaces: mask, hood, drysuit

Pressure Metrics to know - ANSWER @sea level = 14.7 psi

@ 33ft FSW depth 14.7 psi is exerted
.445 psi per ft of depth (.5 psi)
Eardrum trauma @ 8 ft depth or 4 psi

"Gauge pressure" is zero @ sea level

"Absolute Pressure" is gauge + 14.7 psi

"Partial pressure" is pressure exerted by separate gas in air mixture

Equalizing Air Spaces - ANSWER Lungs: breathe normally
Middle Ear: valsalva maneuver
Sinuses: normal breathing, clear sinuses
Stomach/Intestines: diet

What does Stay inside the Box mean? - ANSWER Emphasizing importance on
monitoring depth, safety, conditions and timing of the dive

Boyle's Law - ANSWER A principle that describes the relationship between the
pressure and volume of a gas at constant temperature

Charles' Law - ANSWER the law that states that for a fixed amount of gas at a
constant pressure, the volume of the gas increases as the temperature of the gas
increases and the volume of the gas decreases as the temperature of the gas
decreases

Henry's Law - ANSWER states that at a given temperature, the solubility of a gas in
a liquid is directly proportional to the pressure of the gas above the liquid

Musts while rinsing a regulator - ANSWER Make sure the dust cap is on

Don't press down the button on the regulator

Barotrauma (Over pressurization injury) - ANSWER Ear drum injury: painful but no
tearing. If the ear ruptures you get vertigo

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