abrasion: The process by which a surface is worn down due to friction. Abrasion can also refer to a scratched or scraped surface.
additives: Substances used to improve the performance of lubricants.
antioxidant additives: Substances that reduce oxidation.
asperity: An irregular bump or peak on the surface of a polished metal.
biodegradable: A substance that can be broken down by living organisms such as microorganisms. Biodegradation occur either using oxygen or in a situation without oxygen.
biolubricants: Lubricants that can biodegrade quickly and are less toxic to the environment. Biolubricants often use vegetable oil as bases.
boundary layer: A thin wall of lubricant between two surfaces.
caster oil: A vegetable oil made from the caster bean; used in hydraulic fuels, brake fluids and greases, as well as for medicinal purposes.
compression: The process by which materials are forced into smaller places or areas with less volume.
corrosion: Occurs in metals is due to the exposure of metals to water and oxygen, resulting in a weakened, discolored metal.
detergent additives: Substances used in lubricants to assist in cleaning.
dropping point: The temperature at which a lubricating grease becomes liquid.
dry friction: Occurs between two solid objects.
dry lubricants: See solid lubricants.
emulsification: The process of blending two substances that cannot normally be blended. An example of an emulsion is homogenized milk. Cream will not separate from the rest of the milk in homogenized milk.
environmentally friendly: Materials that will cause little or no damage to the environment.
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