A correction due to nonstandard baro- metric pressure, particularly the sextant altitude correction due to changes in refraction caused by difference between the actual baro- metric pressure and the standard barometric pressure used in the computation of the refraction table.

Related Terms

RESTRICTOR

A device for producing a deliberate pressure drop or resistance in a line by reducing the cross-sectional flow area.

ADJUSTABLE DIFFERENTIAL

A means of changing the difference between the control cut-in and cut-out points.

SAFETY CONTROL

Device to stop unit, equipment or system if unsafe pressure and/or temperatures and/or dangerous conditions are reached.

CONTAMINANT CAPACITY

The weight of a specified artificial contaminant that must be added to the influent to produce a given differential pressure across a filter at specified conditions. Used as an indication of relative service life. Also known as Dirt capacity, Dust capacity

BUBBLE POINT

The differential gas pressure at which the first steady stream of gas bubbles is emitted from a wetted filter element under specified test conditions.

CLEAN ROOM

A facility or enclosure in which air content and other conditions (such as temperature, humidity, and pressure) are controlled and maintained at a specific level by special facilities and operating processes and by trained personnel.

CRACKING

The process whereby large molecules are broken down by the application of heat and pressure to form smaller molecules.

COMPRESSED AIR

Air at any pressure greater than atmospheric pressure.

EMISSION SPECTROMETER

Works on the basis that atoms of metallic and other particular elements emit light at characteristic wavelengths when they are excited in a flame, arc, or spark. Excited light is directed through an entrance slit in the spectrometer. This light penetrates the slit, falls on a grate, and is dispersed and reflected. The spectrometer is calibrated by a series of standard samples containing known amounts of the elements of interest. By exciting these standard samples, an analytical curve can be established which gives the relationship between the light intensity and its concentration in the fluid.

HIGH WATER INEQUALITY

The difference between the heights of the two high waters during a tidal day

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