Length
SI units -
10 millimeters (mm) = 1 centimeters (cm) 10 centimeters = 1 decimeter (dm)
10 decimeters = 1 meter (m) 1000 meters = 1 kilometer (km)
1 mm = 10-3 m 1 µm = 10-6 m
1 Angstrom = 10-10 m
Other units -
1 km = .6214 miles 1 mile = 1.609 km
1 meter = 39.37 in 1 in = .0254 meter
1 mm = .03937 in 1 in = 25.4 mm
12 inches = 1 foot 36 in = 1 yard (yd)
5280 ft = 1 mile 1 cm = .3937 in = .0328 ft
1 light year = 9.461•1015meters 1 fathom = 6 feet
Area
SI units -
1 cm2 = 100 mm2 1 m2 = 1,000,000 mm2
1 m2 = 10,000 cm2 1 km2 = 1,000,000 m2
Other units -
144 square inches (in2) = 1 square foot 43,560 ft2 = 1 arce
1 in2 = 6.4516 cm2 640 arces = 1 square mile
1 m2 = 10.76 ft2 1 cm2 = 0.155 in2
1 mile2 = 640 acres = 2.590 km2
Angles
1 radian = 57.47 degrees 1 quadrant = 1.571 radians
1 degree = 60 minutes 100 quadrants = 90 degrees
1 radian = .637 quadrants
Volume
SI units -
1 cubic centimeter (cc) = 1 cm3 = 1 milliliter (ml) = 1000 mm3
1 liter (l) = 10 cm x 10 cm x 10 cm = 1000 cm3
1 hectoliter (hl) = 100 liters 1 cubic meter = 1000 liters
Other units -
1 gallon (gal) = .13368 ft3 = 3.785 liters 1 barrel (oil) = 42 gallons (oil)
1 U.S. gallon = .8327 Imperial gallon 1 meter3 = 61023 inch3
1 meter3 = 264.2 gallons 1 meter3 = 35.315 feet3
1 meter3 = 1.308 yard3 1 liter = .2642 U.S. gallon 1 liter = .0353 feet3 1 cm3 = .0610 inch3
1 liter = 61.022 inch3
1 gal = 4 quarts = 8 pints = 128 fl. oz = 231 in3
Time
SI units -
1 hour = 60 minutes = 3600 seconds 1 ms = 10-3 s
1 µs = 10-6 s 1 ns = 10-9 s
Other units -
1 day = 24 hours = 1440 min. = 8.64 x 104 seconds
1 year = 365.24 days = 3.156 x 107 seconds
1 fortnight = 2 weeks
Velocity
SI units -
1 kilometer/hour = .27778 meters/second 100 kph = 27.778 m/s
Other units -
1 mile/hour = .447 m/s 60 miles/hour = 88 feet/second
55 mph = 88.5 kph 60 mph = 96.54 kph
1 radian/sec = 9.549 rpm 65 mph = 104.6 kph
1 foot/minute = .0183 km/hour
Mass
SI units -
1 gram (g) = 1000 milligrams (mg)
1 kilogram (kg) = 1000 grams
1 (metric) Ton (t) = 1000 kg
|
1 gram is the mass of 1 cm3 of pure water at 40C 1 kg is the mass of 1 liter of pure water. |
Other units -
1 slug = 32.2 pounds mass (lbm) = 14.59 kg
1 kg = 6.852 x 10-2 slug
|
1 pound mass (lbm) weighs 1 pound force (lbf) on the Earth’s surface where the acceleration of gravity is 32.2 ft/s2 - and - 1 kg weighs 2.205 pounds force. |
Force
SI units -
1 Newton (N) = 1 kg•m/s2
1 kg weighs 9.81 N on the Earth's surface where the
acceleration of gravity is 9.81 m/s2
Other units -
1 lbf = 4.4482 N 1 N = 0.2248 lbf
1 kg weights 2.205 lbf 1 N = 105 dyne
1 ounce = 437.5 grains = .0625 lbf
Energy
|
1 calorie of heat will raise 1 gram of pure water 1°C (at 20°C) |
SI units -
1 joule (J) = 1kg•m2/s2
1 calorie = 4.186 J
1 kcal = 1000 cal = 4186 J
Other units -
1 Quad = 1015 Btu 1 J = .23884 cal
|
1 BTU of heat will raise 1 pound of pure water 1°F (at 39.1°F) |
1 Btu = 778.16 ft_lbf
1 Kilowatt•hour = 3,415.3 Btu
1 Btu/min. = 17.57 Watts
Power
SI units -
1 watt (W) = 1kg•m2/s3 = 1 J/s 1 Kilowatt (kW) = 1000 W
Other units -
1 H.P. = 550 ft•lbf/sec = 33,000 ft•lbf/min. = 745.7 W
1 kW = 1.341 H.P. = 737.6 ft•lbf/sec 1 Btu/min = 0.02357 H.P. = 17.58 W
Temperature
|
Pure water freezes at 0°C and boils at 100°C at standard atmospheric pressure. |
SI units -
Kelvin (K) = Centigrade (C) + 273.16°
Other units -
°F = (1.8 x °C) + 32° °C = (°F - 32°) x .555
Pressure
SI units -
1 Pascal (Pa) = 1 N/m2 1 bar = 105 N/m2
Other units -
1 atmosphere (atm) = 101,325 Pa = 760 torr 1 lbf/in2 = 6.895 x 103 N/m2
1 torr = 1 mm Hg = 133.32 N/m2
1 in H2O = 1.868 mm Hg = 249.1 N/m2
Viscosity
SI units -
1 kg/(m_s) = 1 N_s/m2
Other units -
1 N•s/m2 = 10 Poise
Magnetic Quantities
SI units -
1 Tesla (T) = 1 kg/(C•s) 1 T = 104 Gauss (G) for B
1 G = 1 g1/2/(cm1/2•s) 1 G = 103 C/(m•s) for M
1 G = (1/4_)•103C/(m•s) for H