Unit of Oil
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A "unit" of oil is defined by the American Bowling Congress (ABC) and Women's International Bowling Congress (WIBC) as 0.0167 cubic centimeters of oil evenly spread over a 1 sq. ft. surface, which equates to a film of oil about 7 millionths of an inch thick.
Example: a piece of typing paper is about 400 units thick. (.000007*400=.0028" A 16# bond paper is .0032" thick so that's pretty close.)
