Scuba Glossary: W - X - Y - Z


Wall Diving  –  Occurs on rock and reefs that run vertically, usually run from shallow to deep.

Water capacity Of a cylinder  –   The internal volume. The amount of water it would hold at ambient pressure at 20 °C (68 °F)

Water Pressure  –  Force per unit area exerted by the weight of water, each 33 feet of sea water exerts a pressure equivalent to one atmosphere, or 14.7 psi.

Weighting system  –  Weights, generally made of lead, to counteract the buoyancy of other diving equipment, and the belts, pockets or harnesses used to support them.

Welding shield  –  Cover for the viewport area of a helmet or mask to filter excessive light and UV when welding or oxy-arc cutting.

Wet bell  –  A cable-suspended chamber, open at the bottom, that is lowered underwater to operate as a base or a means of transport for a small number of divers.

Wet filling  –  Filling scuba cylinders using a water bath for cooling the cylinders.

Wet pot  – Water filled hyperbaric chamber.

Wet Suit  –  Any suit that provides thermal protection underwater by trapping a layer of water between the diver’s skin and the suit.

Wheel  –  A dive table used to plan muti-level dives.

Whip  –  Flexible high pressure gas hose with connector at the free end, used for temporary connections. e.g. Filling whip, for filling cylinders, Oxygen whip for oxygen transfer, Blending whip, for decanting gases when blending gas, etc.

Windward  –  A point or side from which the wind blows; in the direction from which the wind blows; as opposed to, leeward.

Wreck Diving  –  Diving on natural or man-made shipwrecks; specialty courses are available.

Wrist slate  –  A small plastic writing surface attached to the diver’s wrist. Can come with mutiple slates and a pencil.


Yaw  –  To swing off course. This is normally caused by bad steering or the action of the waves.

Yoke fitting/valve  –  A fitting or valve used to connect a regulator or filling whip to a diving cylinder using the “international” connection.

Y-valve  –  Dual orifice valve.


Zenith  –  In general terms, the zenith is the direction pointing directly “above” a particular location; that is, it is one of two vertical directions at the location, orthogonal to a horizontal flat surface there. The concept of “above” is more specifically defined in astronomy, geophysics and related sciences (e.g., meteorology) as the vertical direction opposite to the net gravitational force at a given location. The opposite direction, i.e. the direction of the gravitational force is called the nadir. The term zenith also refers to the highest point reached by a celestial body during its apparent orbit around a given point of observation.

Zip tie  –  (also cable tie, tie wrap) Self-locking plastic strip used to connect objects together.

Z-knife  –  Line cutting tool with a replaceable blade in a slot.

Zoom Lens  –  A lens that combines a range of focal lengths.

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