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| Numbers and Conversions | |
|---|---|
| Prefixes | |
| $ \begin{array}{lcl} \mbox{ exa } & = & 10^{18} \mbox{ (one trillion, or one quintillion) }\\ \mbox{ peta } & = & 10^{15} \mbox{ (one thousand billions, or one quadrillion) }\\ \mbox{ giga } & = & 10^{9} \mbox{ (one thousand millions, or one billion) }\\ \mbox{ mega } & = & 10^{6} \mbox{ (one million) }\\ \mbox{ kilo } & = & 10^{3} \mbox{ (one thousand) }\\ \end{array} $ | |
| Length | |
| $ \begin{array}{lcl} 1 \mbox{ kilometer (km) } & = & 1000 \mbox{ meter (m) } \\ 1 \mbox{ meter (m) } & = & 100 \mbox{ centimeter (cm) } \\ & = & 39.37/12 \mbox{ feet (ft) } \\ 1 \mbox{ centimeter (cm) } & = & 10^{-2} \mbox{ m } \\ 1 \mbox{ millimeter (mm) } & = & 10^{-3} \mbox{ m } \\ 1 \mbox{ micron } (\mu ) & = & 10^{-6} \mbox{ m } \\ 1 \mbox{ millimicron (m} \mu ) & = & 10^{-9} \mbox{ m } \\ 1 \mbox{ nanometer (nm)} & = & 10^{-9} \mbox{ m } \\ 1 \mbox{ angstrom (A) } & = & 10^{-10} \mbox{ m } \\ \end{array} $ | |
| Surface | |
| $ \begin{array}{lcl} 1 \mbox{ square meter (m}^2) & = & 10.76 \mbox{ ft}^2 \\ 1 \mbox{ square foot (ft}^2) & = & 929 \mbox{ cm}^2 \\ \end{array} $ | |
| Volume | |
| $ \begin{array}{lcl} 1 \mbox{ liter }( l) = 1000 \mbox{ cm}^3 = 1.057 \mbox{ quart (qt) } = 61,02 \mbox{ in}^3 = 0,03532 \mbox{ ft}^3 \\ 1 \mbox{ cubic meter (m}^3) = 1000 \ l = 35.32 \mbox{ft}^3 \\ 1 \mbox{ cubic foot ( ft}^3 ) = 7,481 \mbox{ U.S gal } = 0.02832 \mbox{ m}^3 = 28,32 \ l \\ 1 \mbox{ US. Gallon (gal) } = 231 \mbox{ in}^3 = 3.785 \ l ; \ 1 \ \mbox{UK . Gal = } 1.201 \mbox{ US. Gallon } = 277,4 \mbox{ in}^3 \\ \end{array} $ | |
| Mass | |
| $ \begin{array}{lcl} 1 \mbox{ kilogram (kg) } = 2,2046 \mbox{ pounds (lb) } = 0,06852 \mbox{ slug ;} 1 \mbox{ lb} = 453,6 \mbox{ gr} = 0,03108 \mbox{ slug}\\ 1 \mbox{ slug } = 34,174 \mbox{ lb} = 14,59 \mbox{kg.}\\ \end{array} $ | |
| Speed | |
| $ \begin{array}{lcl} 1 \mbox{ km/h } = 0,2778 \mbox{ m/s } = 0,6214 \mbox{ mi/h } = 0,9113 \mbox{ ft/s} \\ 1 \mbox{ mi/h } = 1,467 \mbox{ ft/s } = 1,609 \mbox{ km/h } = 0,4470 \mbox{ m/s}\\ \end{array} $ | |
| Density | |
| $ \begin{array}{lcl} 1 \mbox{ g/cm}^3 = 10^3 \mbox{ kg/m}^3 = 62,43 \mbox{ lb/ft}^3 = 1,940 \mbox{ slug/ft}^3 \\ 1 \mbox{ lb/ft}^3 = 0,01602 \mbox{ gm/cm}^3 ; \ 1 \mbox{ slug/ft}^3 = 0,514 \mbox{ g/cm}^3\\ \end{array} $ | |
| Force | |
| $ \begin{array}{lcl} 1 \mbox{ newton (N) } = 10^5 \mbox{ dynes } = 0,1020 \mbox{ Kgp } = 0,2248 \mbox{ lb wt}\\ 1 \mbox{ pound weight (lbwt) } = 4,448 \mbox{ N} = 0,4536 \mbox{ kgp } = 32,17 \mbox{ poundals}\\ 1 \mbox{ kilogram poids (kg p) } = 2,205 \mbox{ lbwt } = 9,807 \mbox{ N }\\ 1 \mbox{ US short ton } = 2000 \mbox{ lbwt ; } 1 \mbox{ long ton } = 2240 \mbox{ lbwt ; } 1 \mbox{ metric ton }= 2205 \mbox{ lbwt} \\ \end{array} $ | |
| Energy | |
| $ \begin{array}{lcl} 1 \mbox{ joule } = 1 \mbox{ Nm } = 10^7 \mbox{ erg } = 0,7376 \mbox{ (ft lbwt) } = 0,2889 \mbox{ cal} = 9,481 \times 10^{-4} \mbox{ Btu}\\ 1 \mbox{ ft lbwt } = 1,356 \mbox{ joule } = 0,3239 \mbox{ cal } = 1,285 \times 10^{-3} \mbox{ Btu }\\ 1 \mbox{ calorie (cal) } = 4,186 \mbox{ joule } = 3,087 \mbox{ ft lbwt } = 3,968 \times 10^{-3} \mbox { Btu }\\ 1 \mbox{ Btu (British thermal unit) } = 778 \mbox{ ft lbwt } = 1055 \mbox{ joules } = 0,293 \mbox { watt/hour }\\ 1 \mbox{ kilowatt hour (kwh) } = 3,60 \times 10^6 \mbox{ joule } = 860,0 \mbox{ kcal } = 3413 \mbox { Btu }\\ 1 \mbox{ electron volt (ev) } = 1,602 \times 10^{-19} \mbox{ joule } \\ \end{array} $ | |
| Power | |
| $ \begin{array}{lcl} 1 \mbox{ watt } = 1 \mbox{ joule/s } = 10^7 \mbox{ erg/s } = 0,2389 \mbox{ cal/s }\\ 1 \mbox{ horse power (HP) } = 550 \mbox{ ft lbwt/s } = 33.000 \mbox{ ft lbwt/min. } = 745,7 \mbox{ watt }\\ 1 \mbox{ kilowatt (kw) } = 1,341 \mbox{ Hp } = 737,6 \mbox{ ft lbwt/s } = 0,9483 \mbox { Btu/s }\\ \end{array} $ | |
| Pressure | |
| $ \begin{array}{lcl} 1 \mbox{ N/m}^2 = 10 \mbox{ dynes/cm}^2 = 0,869 \times 10^{-6} \mbox{ atmosphere } = 2,089 \times 10^{-2} \mbox{ lbwt/ft}^2\\ 1 \mbox{ lbwt/in}^2 = 6895 \mbox{ N/m}^2 = 5,171 \mbox{cm of mercury} = 27,68 \mbox{ in. water}\\ 1 \mbox{ atmosphere (atm) } = 1,013 \times 10^5 \mbox{ N/m}^2 = 1,013 \times 10^6 \mbox{ dynes/cm}^2 = 14,70 \mbox{ lbwt/in}^2 \\ \mbox{ }\ \ \qquad \qquad \qquad \qquad = 76 \mbox{ cm of mercury} = 406,8 \mbox{ in. water}\\ \end{array} $ | |
