SSI open water 2023/ 138 Questions
and Answers/Graded A+.
How much does air weigh per cubic foot? - -0.8 lbs
-How much does fresh water weigh per cubic foot? - -62.5 lbs
-how much does salt water weigh per cubic foot? - -64 lbs
-what does SCUBA stand for? - -Self contained underwater breathing apparatus
-Absolute pressure (ambient pressure) - -the total pressure exerted on an object; 1
atmosphere exerted by air above the surface + additional pressure by water at depth.
-gauge pressure - -the pressure readings on gauges that reads zero at 1 atmosphere
-Boyle's Law - -pressure and volume are inversely proportional
-Where does the greatest relative volume change take place? - -between 0 and 33 feet
-what are the 5 largest air spaces in you body? - -ears, sinuses, lungs, teeth, and
intestines
-What are the three ways to equalize your ears? - -swallowing, rotating the jaw,
Valsalva technique
-Where do you lose most of your body heat? - -head, torso, underarms, and groin
-how does refraction alter images underwater? - -33% larger
25% closer
, -absorption - -colors diminish in intensity and virtually disappear until you can see
only blues and purples
-thermoclines - -layers of different temperatures in water due to the higher density of
cold water
-how much faster can you lose body heat underwater compared to air? - -25-30x
-How is sound different underwater? - -4x faster, seems to come from all directions,
travels greater distances underwater
-safety stop signal - -hand flat horizontally, three fingers pointing into it
-how much air signal - -hand facing out, two fingers placed on palm
-half air signal - -hand horizontal, other hand vertical into middle of it (looks like a
time out)
-equalize signal - -motion of holing nose on mask
-low on air signal - -outward facing fist
-out of air signal - -slice throat motion
-share air signal - -touch regulator
-ok out of water signal - -arching arm with fist on head
-ears not clearing signal - -point at ears
-something is wrong signal - -hand in front of chest moving in circular motion
and Answers/Graded A+.
How much does air weigh per cubic foot? - -0.8 lbs
-How much does fresh water weigh per cubic foot? - -62.5 lbs
-how much does salt water weigh per cubic foot? - -64 lbs
-what does SCUBA stand for? - -Self contained underwater breathing apparatus
-Absolute pressure (ambient pressure) - -the total pressure exerted on an object; 1
atmosphere exerted by air above the surface + additional pressure by water at depth.
-gauge pressure - -the pressure readings on gauges that reads zero at 1 atmosphere
-Boyle's Law - -pressure and volume are inversely proportional
-Where does the greatest relative volume change take place? - -between 0 and 33 feet
-what are the 5 largest air spaces in you body? - -ears, sinuses, lungs, teeth, and
intestines
-What are the three ways to equalize your ears? - -swallowing, rotating the jaw,
Valsalva technique
-Where do you lose most of your body heat? - -head, torso, underarms, and groin
-how does refraction alter images underwater? - -33% larger
25% closer
, -absorption - -colors diminish in intensity and virtually disappear until you can see
only blues and purples
-thermoclines - -layers of different temperatures in water due to the higher density of
cold water
-how much faster can you lose body heat underwater compared to air? - -25-30x
-How is sound different underwater? - -4x faster, seems to come from all directions,
travels greater distances underwater
-safety stop signal - -hand flat horizontally, three fingers pointing into it
-how much air signal - -hand facing out, two fingers placed on palm
-half air signal - -hand horizontal, other hand vertical into middle of it (looks like a
time out)
-equalize signal - -motion of holing nose on mask
-low on air signal - -outward facing fist
-out of air signal - -slice throat motion
-share air signal - -touch regulator
-ok out of water signal - -arching arm with fist on head
-ears not clearing signal - -point at ears
-something is wrong signal - -hand in front of chest moving in circular motion
