Gauge
An instrument or device for measuring, indicating or comparing a physical characteristic.

Galling
A form of wear in which seizing or tearing of the gear or bearing surface occurs.

Gasohol
A blend of 10% anhydrous ethanol (ethyl alcohol) and 90% gasoline, by volume. Used as a motor fuel.

GATT
General Agreement on Tariffs and Trade

Generated contaminant
Caused by a deterioration of critical wetted surfaces and materials or by a breakdown of the fluid itself.

Graphite
A crystalline form of carbon having a laminar structure, which is used as a lubricant. It may be of natural or synthetic origin.

Gravimetric analysis
A method of analysis whereby the dry weight of contaminant per unit volume of fluid can be measured showing the degree of contamination in terms of milligrams of contaminant per litre of fluid.

Gravity
See Specific Gravity; API Gravity.

Grease
A lubricant composed of an oil or oils thickened with a soap, soaps or other thickener to a semisolid or solid consistency.
 
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