The International System of Units
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Length
Common Multiples and Subdivisions | ||
---|---|---|
kilometer (km) | 10^{3} m | |
decimeter (dm) | 10^{-1} m | |
centimeter (cm) | 10^{-2} m | |
millimeter (mm) | 10^{-3} m | |
micrometer (µm)* | 10^{-6} m | |
nanometer (nm) | 10^{-9} m | |
angstrom (Å) | 10^{-10} m |
*Also called the micron (µ)
Mass
Common Multiples and Subdivisions | ||
---|---|---|
kilogram (kg) | 10^{3} g (2.2 lb) | |
centigram (cg) | 10^{-2} g | |
milligram (mg) | 10^{-3} g | |
microgram (µg) | 10^{-6} g | |
nanogram (ng) | 10^{-9} g | |
picogram (pg) | 10^{-12} g |
Volume
Basic unit is the liter, which equals 1 cubic decimeter, dm^{3} (1.06 quart). A liter of water at its maximum density weighs almost 1 kg. Therefore, 1 ml (= 10^{-3} liter) of water weighs, for all practical purposes, 1 g. One cubic centimeter (cm^{3} or cc) is 10^{-3} dm^{3}. Therefore, it is equal to 1 ml, and the units ml and cc are used interchangeably.
Temperature
Basic unit is the Celsius (formerly known as centigrade) degree, ^{o}C. 0^{o}C is the freezing point of water; 100^{o}C is the boiling point of water. To convert from ^{o}C to ^{o}F (Fahrenheit) or vice versa: ^{o}F - 32 = 9/5 ^{o}C.
Useful Equivalents
- Length
- 1 inch = 2.54 cm
- Mass
- 1 oz = 28.35 g
1 lb = 453.6 g
- Volume
- 1 U.S. fluid oz = 29.57 ml
1 U.S. liquid qt = 0.946 liter (l)
- Pressure
- 1 pound per square inch (psi) = 6.89 kilopascals (kPa)
- Radiation dose
- 1 millisievert (mSv) = 100 millirems (mrem)
Some Useful Constants and Conversion Factors
The gas constant: R = 2 cal / [(mole)(°K)]
The Faraday constant: F = 23,062 cal / [(mole)(volt)]
The natural logarithm, ln, = (2.303)(log_{10})
13 February 2012