PTYS206-2 Spring 2008 Cheat Sheet: Unit Conversions 1. Units of distance (SI unit – meter) 1 meter = 3.28 feet 1 mile = 1609 meters 1 centimeter = 0.3937 inches 1 furlong = 201.168 meters 1 yard = 3 feet 1 league = 4828 meters 1 nautical mile = 1852 meters 1 astronomical unit = 1.496 x 1011 meters 1 light year = 9.461 x 1015 meters 1 parsec = 3.086 x 1016 meters 1 fathom = 1.8288 meters 1 angstrom = 10-10 meters 2. Units of mass (SI unit – kilogram) 1 kilogram = 2.2 pounds (of mass) 1 gram = 15.432 grains 1 ton (US) = 907.185 kilograms 1 ton (metric) = 1000 kilograms 1 stone = 6.35029 kilograms 1 atomic mass unit = 1.661 x 10-27 kilograms 1 solar mass = 1.9891 x 1030 kilograms 3. Units of time (SI unit – second) 1 hour = 3600 seconds 1 day = 24 hours = 86400 seconds 1 sidereal month = 27.32 days 1 fortnight = 14 days 1 microfortnight = 1.2096 seconds 4. Units of force (SI unit – Newton) 1 Newton = 1 kg m/s2 1 Newton = 105 dynes 1 Newton = 0.225 pounds (of force) 1 sthène = 1000 Newtons 1 kip = 4444 Newtons 5. Units of pressure (SI unit – Pascal) 1 Pascal = 1 N/m2 = 1 kg/m s2 1 bar = 105 Pascals 1 atmosphere = 1.01325 bars1 torr = 133.322 Pascals 1 psi (pounds per square inch) = 6894.76 Pascals 1 torr = 1 mmHg (millimeters of mercury) 6. Units of energy (SI unit – Joule) 1 Joule = 1 Nm = 1 kg m2/s2 1 Joule = 107 erg 1 electron-volt (eV) = 1.602 x 10-19 Joules 1 ton of TNT = 4.2 x 109 Joules 1 foot-pound = 1.3558 Joules 1 kilowatt-hour = 3.6 x 106 Joules 1 calorie = 4.184 Joules 1 Calorie (food calories) = 1000
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