Unformatted text preview: Measurable “units” are specific values of dimensions defined by convention, such as grams for mass, seconds for time, or meters for length. Read Felder and Rousseau, Chapter 2. January 18 Æ We will study units and unit conversion. In engineering Measurable units In math Countable units Æ specific values of dimension 3 cm – 1 cm = 2 cm 3 cm – 1 mm = 2.9 cm 3 cm – 1 sec = “incalculable” 3 – 1 = 2 (always) 3x – 1x = 2x only when x has the same dimension / unit 3x – 1x = 2x (do not define what x is) Numerical values of two quantities may be added or subtracted only if the units are the same....
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 Spring '08
 SEONGKIM
 Chemical Engineering, Mass Balance

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