An instrument which measures the density or specific gravity of a liquid, gas, or solid. Also known as densitometer; density gage; density indicator; gravitometer.

Related Terms

PLI

A unit of line density (mass per unit length) equal to 1 pound per inch, or approximately 17.8580 kilograms per meter.

PHOTOELECTRIC SMOKE-DENSITY CONTROL

A photoelectric control system used to measure, indicate, and control the density of smoke in a flue or stack.

PERMEAMETER

1. A laboratory device for measurement of permeability of materials, for example, soil or rocks; consists of a powder bed of known dimension and degree of packing through which the particles are forced; pressure drop and rate of flow are related to particle size, and pressure drop is related to surface area. 2. A device for measuring the coefficient of permeability by measuring the flow of fluid through a sample across which there is a pressure drop produced by gravity. 3. An instrument for measuring the magnetic flux or flux density produced standard output is being exceeded.

N-TYPE SEMICONDUCTOR

An extrinsic semiconductor in which the conduction electron density exceeds the hole density.

N-TYPE GERMANIUM

Germanium to which more impurity atoms of donor type (with valence 5, such as antimony) than of acceptor type (with valence 3, such as indium) have been added, with the result that the conduction electron density exceeds the hole density.

NICHOLSON'S HYDROMETER

A modification of Fahrenheit's hydrometer in which the lower end of the instrument carries a scale pan to permit the determination of the relative density of a solid.

MILLIMETER OF MERCURY

A unit of pressure, equal to the pressure exerted by a column of mercury 1 millimeter high with a density of 13.5951 grams per cubic centimeter under the standard acceleration of gravity; equal to 133.322387415 pascals; it differs from the torr at the bottom used for hauling bulk materials. mineral engineering See mining engineering.

METAL OXIDE SEMICONDUCTOR INTEGRATED CIRCUIT

An integrated circuit using metal oxide semiconductor transistors; it can have a higher density of equivalent parts than a bipolar integrated circuit.

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.

HOPE'S APPARATUS

An apparatus consisting of a vessel containing water, a freezing mixture in a tray surrounding the vessel, and thermometers inserted in the water at points above and below the freezing mixture; used to show that the maximum density of water lies at about 4 C.

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