A type of diving in which the diver's breathing medium is a normal atmospheric mixture of oxygen and nitrogen; limited to depths of 190 feet (58 meters).

Related Terms

NITROGEN FIXATION

Conversion of atmospheric nitrogen into compounds such as ammonia, calcium cyanamide, or nitrogen oxides by chemical or electric-arc processes.

METEOROLOGICAL ROCKET

Small rocket system used to extend observation of atmospheric character above feasible limits for balloon-borne observing and telemetering instruments. Also known as rocketsonde.

MERCURY BAROMETER

An instrument which determines atmospheric pressure by measuring the height of a column of mercury which the atmosphere will support; the mercury is in a glass tube closed at one end and placed, open end down, in a well of mercury. Also known as Torricellian barometer.

LOWRY PROCESS

A system for wood preservation which uses atmospheric pressure at the start and then introduces preservative into the wood in a vacuum.

INCH OF MERCURY

The pressure exerted by a 1-inch-high (2.54-centimeter) column of mercury that has a density of 13.5951 grams per cubic centimeter when the acceleration of gravity has the standard value of 9.80665 m/s2 or approximately 32.17398 ft/s2 equal to 3386.388640341 pascals; used as a unit in the measurement of atmospheric pressure.

IMPACTOR

A general term for instruments which sample atmospheric suspensoids by impaction; such instruments consist of a housing which constrains the air flow past a sensitized sampling plate. Also known as impactometer.

HUMIDITY ELEMENT

The transducer of any hygrometer, that is, that part of a hygrometer that quantitatively senses atmospheric water vapor.

COMPRESSED AIR

Air at any pressure greater than atmospheric pressure.

PRESSURE GAGE

Pressure differential above or below atmospheric pressure.

HYGROSCOPE

An instrument which indicates variation in atmospheric moisture

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