1. A gas manometer whose calibration, which is the same for all ideal gases, can be calculated from the measurable physical constants of the instrument. 2. A manometer that measures absolute pressure.


Related Terms

HYDROCARBON GAS

A gas composed completely of hydrocarbons

ISOCONCENTRATION MAP

Map or diagram of a liquid or gas system's concentration with respect to a single component of the system, shown by constant-concentration contour lines.

CERAMIC RADIANT

A baked-clay component of a gas heating unit which radiates heat when incandescent from the gas flame.

STACK LOSS

The fraction of total heat which exits with the flue gas through the stack. The quantity is customarily expressed as a percent of the total heat input. The stack loss is directly proportional to the stack exit temperature; the higher the temperature, the greater the stack loss.

BRAYTON CYCLE

An ideal cycle in which compression and expansion take place at constant entropy, an ideal gas turbine.

BACK-RUN PROCESS

A process for manufacturing water gas in which part of the run is made down, by passing steam through the superheater, thence up through the carburetor, down through the generator, and direct to the scrubbers.

XENON

A heavy, colourless and odourless inert gas found in the atmosphere.

JOULE-THOMSON COEFFICIENT

The ratio of the temperature change to the pressure change of a gas undergoing isenthalpic expansion.

ABSORPTION NUMBER

A dimensionless group used in the field of gas absorption in a wetted-wall column.

ELECTRON VACUUM GAGE

An instrument used to measure vacuum by the ionization effect that an electron flow (from an incandescent filament to a charged grid) has on gas molecules.

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