The International System of units, also known as the SI or Le Systeme International, has been fully adopted by every industrialized country except for the United States, which still uses the English system of units, or the US Customary System (USCS). The SI is a simple and logical system based on decimal relationships between the various units making it incredibly easy and efficient to use, especially in the fields of science and engineering. For example, 1000 g = 1 kg, 100 cm = 1m, 1 liter of water has a mass of 1 kg. The list goes on and on. The USCS, however, has no apparent systematic numerical base, and the various units in the system are related to each other rather arbitrarily (e.g. 1 ft = 12 in, 1 mile = 5280 ft, 16 oz = 1 lbm, 128 fl oz. = 1 gal).
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