Sea level

Sea level

The altitude of the world's oceans; all oceans are at sea level.

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Part of Speech: noun
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Industry/Domain: Sports
Category: Scuba diving
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Related terms

sea level

Weather; Meteorology

The arithmetic mean of hourly heights observed over some specified period. In the United States, mean sea level is defined as the mean height of the surface of the sea for all ...

sea level

Chemistry; Weather; Atmospheric chemistry

This is the average level of the ocean over the entire earth. Tidal fluctuation is taken into account when determining sea level. Mean Sea Level (MSL) is used to reference the ...

sea-level

Geography; Physical geography

Average elevation of the surface of the oceans.

sea level

Geography; Geography

Sea level is height of a sea or ocean.

sea level

Sports; Scuba diving

The altitude of the world's oceans; all oceans are at sea level.

sea level

Weather; General weather

The height or level of the sea surface at any time. It is used as a reference for elevations above and below. Refer to mean sea level.

immersion hypothermia

Sports; Scuba diving

The lowering of body temperature when a diver is fully immersed in cold water without proper thermal protection.

hookah

Sports; Scuba diving

A surface-supplied compressed air apparatus, for use in shallow diving in calm waters. The air is delivered to one or more divers through a long hose.

rebreather

Sports; Scuba diving

A closed-circuit system which filters exhaled air, then recirculates it for rebreathing by the diver; requires special training and maintenance.

high pressure nervous syndrome (HPNS)

Sports; Scuba diving

A condition which results from breathing Helium under high pressures. Early symptoms of HPNS are sometimes seen as shallow as 300FSW but more commonly over 600FSW. The severity ...