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Apnea & Spearfishing
PTRD Diving Centers
June 24, 2017
September 8, 2020
Descending underwater the increase in pressure is constant at ______ Atmosphere every 10 metres.
A body immersed in a fluid is ______________by the column fluid above it.
While you dive, in order to evaluate the hydrostatic equilibrium, is important to consider the relation between volume and weight of:
the BCD, the density of the liquid and the neoprene suit
the human body, the density of the liquid and the neoprene suit
the human body, the density of the liquid and the BCD
the human body, the BCD and the neoprene suit
The tendency of the body to float is:
“At a constant temperature the volume of a gas varies _____________ with absolute pressure while the density of a gas varies ________ with absolute pressure”
inversely - directly
directly - inversely
In the case of loss of regulator it is necessary to ascent and continue to
underwater the objects appear _____________by about 1/3, water also absorbs light, an effect that increases with wather depth.
farther and bigger
closer and bigger
closer and smaller
farther and smaller
Underwater sounds are transmitted ______________ because water has a greater density than air.
much more slowly
much more quickly
our body contains cavities filled with gas that subjected with pressure are compensated for in two ways:
reduction of pressure - increase volume
balance of pressure - increase volume
increase pressure - reduction of volume
reduction of pressure - balance of volume
Undewater it is always necessary to ____________ the mask
Time is Up!
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