1
Q
How much closer and larger do objects appear underwater?
A
25% closer and 1/3 larger.
2
Q
What is turbidity?
A
Suspended particles.
3
Q
What is turbidity’s greatest impact on divers?
A
Loss of visibility.
4
Q
How much denser is water than air?
A
800 times denser.
5
Q
How much faster do sound waves move in water?
A
4 times faster.
6
Q
How does sound arrive differently underwater?
A
Sound arrives at each ear simultaneously underwater, making it difficult to determine direction.
7
Q
A
8
Q
How much faster does water conduct heat away from the body than air?
A
25 times faster than air.
9
Q
When do you need thermal protection in water?
A
Anytime the water is colder than 30 C/86 F
10
Q
What is an abrupt temperature change in water called?
A
Thermoclines.
Scuba Cert
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