A self-recording instrument used on aircraft for the simultaneous recording of atmospheric pressure, temperature, and humidity.
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NITROGEN FIXATION
Conversion of atmospheric nitrogen into compounds such as ammonia, calcium cyanamide, or nitrogen oxides by chemical or electric-arc processes.
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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.
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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.
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LOWRY PROCESS
A system for wood preservation which uses atmospheric pressure at the start and then introduces preservative into the wood in a vacuum.
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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.
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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.
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HUMIDITY ELEMENT
The transducer of any hygrometer, that is, that part of a hygrometer that quantitatively senses atmospheric water vapor.
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COMPRESSED AIR
Air at any pressure greater than atmospheric pressure.
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PRESSURE GAGE
Pressure differential above or below atmospheric pressure.
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HYGROSCOPE
An instrument which indicates variation in atmospheric moisture
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