The adjusted pressure for a weather station's barometer and its aerodrome's height, assuming International Standard Atmosphere (ISA) conditions. An aircraft's altimeter set to QFE will read zero on the runway.
Related Terms |
RESTRICTOR
A device for producing a deliberate pressure drop or resistance in a line by reducing the cross-sectional flow area.
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SAFETY CONTROL
Device to stop unit, equipment or system if unsafe pressure and/or temperatures and/or dangerous conditions are reached.
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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
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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.
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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.
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CRACKING
The process whereby large molecules are broken down by the application of heat and pressure to form smaller molecules.
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COMPRESSED AIR
Air at any pressure greater than atmospheric pressure.
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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.
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HORIZON SYSTEM OF COORDINATES
A set of celestial coordinates based on the celestial horizon as the primary great circle; usually altitude and azimuth or azimuth angle.
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DIFFERENTIAL PRESSURE INDICATOR
An indicator which signals the difference in pressure between any two points of a system or a component.
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