The largest gravitational perturbations of artificial satellites which are caused by the fact that the gravity field of the earth is not spherically symmetrical.


Related Terms

OLEOMETER

1. A device for measuring specific gravity of oils. 2. An instrument for determining the proportion of oil in a substance.

NEGATIVE WORK

Work that is performed with the assistance of gravity so that the muscular effort required involves only control of the load.

MOVINGBED

[CHEMENG] Granulatedsolidsina process vessel that are circulated (moved) either mechanically or by gravity flow; used in catalytic and absorption processes.

MECHANICAL SEPARATION

A group of industrial operations by means of which particles of solid or drops of liquid are removed from a gas or liquid, or are separated into individual fractions, or both, by gravity separation (settling), centrifugal action, and filtration.

LACTOMETER

A hydrometer used to measure the specific gravity of milk. ladder-bucket dredge See bucket-ladder dredge.

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.

HYDRAULIC CLASSIFIER

A classifier in which particles are sorted by specific gravity in a stream of hydraulic water that rises at a controlled rate; heavier particles gravitate down and are discharged at the bottom, while lighter ones governing device.

HUMP YARD

A switch yard in a railway system that has a hump or steep incline down which freight cars can coast to prescheduled locations. Also known as gravity yard.

HOT-AIR FURNACE

An encased heating unit providing warm air to ducts for circulation by gravity convection or by fans.

HOLLOW GRAVITY DAM

A fixed gravity dam, usually of reinforced concrete, constructed of inclined slabs or arched sections supported by transverse buttresses.

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