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Terms in this set (11)
The greatest relative pressure change in sea water takes place between ____ and ____ feet.
Ear squeeze can be prevented by:
Never diving with a cold
Rotating the jaw, swallowing, or valsalva
One atmosphere of pressure is defined as:
-1 atmosphere or bar
-Each 34 feet of depth in freshwater
-Each 33 feet of depth in sea water
Which of the following statements concerning sound transmission underwater is correct?
Sound travels four times faster underwater than air
Sound will travel farther underwater than in air
Divers find it difficult to locate the direction of a sound producing source
The event that led to the use of the acronym SCUBA to describe diving was:
The development of the demand regulator in 1943
Absolute pressure is defined as:
The total pressure exerted on an object
Sinus squeeze can be prevented by:
Not diving with a cold
The first symptom of a sinus squeeze is usually:
A sharp pain or wedging sensation above the eyes
Gauge pressure is defined as:
absolute pressure minus 1 ATA
Salt water weighs ___ pounds per cubic foot and freshwater weighs ___ pounds per cubic foot.
The condition in which certain colors are diminished as depth increases is called:
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