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