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In this book, we have used both MKS and CGS units. USCS units or FPS units used in the US Edition of the book have been converted to SI units throughout the text and problems. However, in case of data sourced from handbooks, government standards, and product manuals, it is not only extremely di‰cult to convert all values to SI, it also encroaches upon the intellectual property of the source. Also, some quantities such as the ASTM grain size number and Jominy distances are generally computed in FPS units and would lose their relevance if converted to SI. Some data in figures, tables, examples, and references, therefore, remains. | SI EDITION power SYSTEM ANALYSIS DESIGN J. DUNCAN GLOVER MULUKUTLA S.SARMA THOMAS J. OVERBYE This page intentionally left blank CONVERSIONS BETWEEN U.S. CUSTOMARY UNITS AND SI UNITS Continued U.S. Customary unit Times conversion factor Equals SI unit Accurate Practical Moment of inertia area inch to fourth power in 416 231 416.000 millimeter to fourth power mm4 inch to fourth power in 0.416231 X IO 6 0.416 X 10 6 meter to fourth power m4 Moment of inertia mass slug foot squared slug-fit2 1.35582 1.36 kilogram meter squared kgm2 Power foot-pound per second ft-lb s 1.35582 1.36 watt J s or N-m s w foot-pound per minute ft-lb min 0.0225970 0.0226 watt w horsepower 550 ft-lb s hp 745.701 746 watt w Pressure stress pound per square foot psf 47.8803 47.9 pascal N m2 Pa pound per square inch psi 6894.76 6890 pascal Pa kip per square foot ksf 47.8803 47.9 kilopascal kPa kip per square inch ksi 6.89476 6.89 megapascal MPa Section modulus inch to third power in 16.387.1 16.400 millimeter to third power mm3 inch to third power in 16.3871 X IO6 16.4 X IO 6 meter to third power m3 Velocity linear foot per second ft s 0.3048 0.305 meter per second m s inch per second in. s 0.0254 0.0254 meter per second m s mile per hour mph 0.44704 0.447 meter per second m s mile per hour mph 1.609344 1.61 kilometer per hour km h Volume cubic foot ft3 0.0283168 0.0283 cubic meter nr cubic inch in 16.3871 X 106 16.4 X 10 6 cubic meter n cubic inch in 16.3871 16.4 cubic centimeter cc cm3 gallon 231 in gal. 3.78541 3.79 liter L gallon 231 in gal. 0 00378541 0 00.379 cubic meter IT An asterisk denotes an exact conversion factor Note To convert from SI units to uses units divide by the conversion factor Temperature Conversion Formulas T C T F - 32 T K - 273.15 7ỴK 7X F - 32 273.15 T C 273.15 n_ 9 _ . 9 r F - T C 32 --T K - .
