The Easiest Way to Convert Units in an Algebraic （最简单的方法在一个代数转换单位）.pdf

The Factor-Label Method of Unit Conversion The Easiest Way to Convert Units in an Algebraic Equation Physics professors teach you to convert everything into standard SI units, solve the problem, and hope the units come out right. In Chemistry and the Engineering disciplines, we use the three-step Factor-Label Method of Unit Conversion to solve algebraic problems with mixed units; this method is more useful for real problems, because real objects often have mixed unit measurements...a 4 ft. x 8 ft. x ½ inch sheet of plywood; a 1½ in. x 3½ in. x 8 ft. board. Even metric steel I- beams have mixed units: depth in millimeters, length in meters, mass per unit length in kilograms per meter (which has to be converted into weight per unit length). Follow these three easy steps to solve unit problems: Step 1 Write the algebraic equation so the desired quantity is on the left of 1ft. = 12in. the equals sign, and an algebraic expression is on the right of the equals sign. 3 1m = 100cm = 10 mm 3 Step 2 Draw a horizontal line on the page, and enter numbers and units 1kip = 10 lb. 2 above and below the line according to the algebraic expression. 1 Pa = 1N / m Step 3 Draw a vertical line to show the separation between each unit Metric prefixes conversion, and enter all unit conversions necessary to solve the problem. If milli- (m ) = 10−3 the unit is raised to a power, then