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ENGR 1166 (4)
Lecture 1

ENGR 1166 Lecture 1: Units and Dimensions
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Department
Engineering
Course
ENGR 1166
Professor
Dean Burkey
Semester
Spring

Description
11917 Units and Dimensions Dimensions the measurement of something in physical space Used to describe physical properties Independent of units Number of dimensions = number of physical properties Fundamental dimensions Mass (m) Length (L) Temperature (T) Time (t) Derived dimensions Volume ( Area ( Velocity () Acceleration () Force (m*g = m * = ) Energy Different system of units SI (International System) CGS (Centimeters, grams, seconds) (length, mass, time) English system (US system) SI basic units Fundamental Dimensions Namedimension Unit Symbol Length meter m Mass kilogram kg (=1000 grams) Time second s Temperature Centigrades, Celsius C Electric Current ampere A Amount of Substance mole mol Light intensity candela cd Derived Dimensions Namedimension Unit Symbol Amount Volume liter L 0.001 Force Newton N Pressure Pascal Pa Energy, work Joule (SI) J 1 N * m = 1 dyne * cm = Erg (CGS)
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