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3.1 Units of Measurement > 3.1.1 SI System - Pg. 76

76 SecTion | 3 Fundamentals and Units of Measurement where, L is length, W is width, D is distance, T is time. Area = L # W D Velocity = T A physical quantity is specified by a number and a unit: for instance, 16 ft or 5 m. 3.1.1 Si System The SI system (from the French Système International d'Unités) is the accepted international modernized metric system of measure- ment. It is used worldwide with the exception of a few countries