1. The path of a body or particle under the influence of a gravitational or other force.
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AGGLOMERATION
The potential of the system for particle attraction and adhesion.
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ISO SOLID CONTAMINANT CODE (ISO 4406)
A code assigned on the basis of the number of particles per unit volume greater than 5 and 15 micrometers in size. Range numbers identify each increment in the particle population throughout the spectrum of levels.
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FATIGUE PLATELETS
Normal particles between 20 and 40 microns found in gear box and rolling element bearing oil samples observed by analytical ferrography. A sudden increase in the size and quantity of these particles indicates excessive wear.
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EROSION
The progressive removal of a machine surface by cavitation or by particle impingement at high velocities.
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FATIGUE CHUNKS
Thick three-dimensional particles exceeding 50 microns indicating severe wear of gear teeth.
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BETA-RATIO (ß-RATIO)
The ratio of the number of particles greater than a given size in the influent fluid to the number of particles greater than the same size in the effluent fluid, under specified test conditions (see 'Multi-Pass Test').
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FERROGRAPHY
An analytical method of assessing machine health by quantifying and examining ferrous wear particles suspended in the lubricant or hydraulic fluid.
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INSOLUBLES
Particles of carbon or agglomerates of carbon and other material. Indicates deposition or dispersant drop-out in an engine. Not serious in a compressor or gearbox unless there has been a rapid increase in these particles.
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INGRESSION LEVEL
Particles added per unit of circulating fluid volume.
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ATOM
The smallest complete particle of an element, which can be obtained, yet which retains all physical and chemical properties of the element.
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