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Excerpts — Scuba Diving-5th Edition

Using Scuba Diving Hand Signals

Scuba divers use several hand signals that are not used for skin diving. The signals specific to scuba diving relate to air supply.

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Dive-Planning Factors

Many factors affect your plans for a dive or a diving trip. Keep the following considerations in mind when you are looking ahead to a dive outing.

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Selecting a Dive Course

There are many diver training organizations and thousands of professional diving educators. Your phone book might list diving businesses that offer sanctioned courses. Many universities, community colleges, and recreational departments also offer scuba courses.

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Buoyancy

An object’s ability to float in a liquid depends on the density of the object compared with the density of the fluid in which the object is immersed. Water exerts pressure equally in all directions, even upward. You can feel the upward force (buoyancy) of water when you try to push something under the water.

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