A unit of length. One millionth of a meter. Also known as micron. 1 Micrometer = 39 millionths of an inch (.000039 inch). Contaminant size is usually described in microns. Relatively speaking, a grain of salt is about 60 microns and the eye can see particles to about 40 microns. Many hydraulic filters are required to be efficient in capturing a substantial percentage of contaminant particles as small as 5 microns.

Related Terms


Device for the blending together of solid particles and a liquid, with the final formation of a single paste phase.


Determination of the proportion of particles of a specified size in a granular or powder sample.


Solids sizereducer in which particles are broken by a set of oscillating bars arranged in cylindrical form over a screen of suitable mesh.


Cartridge-type filter used in automotive oil-lubrication systems to remove metal particles and products of heat decomposition from the circulating oil.


The classical mechanics of Newton and Einstein as opposed to the quantum mechanics of Heisenberg, Schro dinger, and Dirac; particles have definite position and velocity, and they move according to Newton's laws.


The law that every two particles of matter in the universe attract each other with a force that acts along bombardment is recorded. neutron logging See neutron well logging.


The mutual attraction of any two particles in the universe, as given by Newton's law of gravitation.


A membrane separation process in which particles greater than about 20 nanometers in diameter are screened out of a liquid in which they are suspended.


1. A size of screen or of particles passed by it in terms of the number of openings occurring per linear inch in each direction. Also known as mesh size. 2. A set of branches forming a closed path in a network so that if any one branch is omitted from the set, the remaining branches of the set do not form a closed path. Also known as loop. 3. Engagement or working contact of teeth of gears or of a gear and a rack.


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.

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