Appendix G - Weights and Measures

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 Appendixes A Abbreviations B InternationalOrganizations and Groups C Selected InternationalEnvironmental Agreements D Cross-Reference List of Country Data Codes E Cross-Reference List of Hydrographic Data Codes F Cross-Reference List of Geographic Names G Weights and Measures

 Note: At this time, only three countries - Burma, Liberia, and the US - have not adopted the International System of Units (SI, or metric system) as their official system of weights and measures. Although use of the metric system has been sanctioned by law in the US since 1866, it has been slow in displacing the American adaptation of the British Imperial System known as the US Customary System. The US is the only industrialized nation that does not mainly use the metric system in its commercial and standards activities, but there is increasing acceptance in science, medicine, government, and many sectors of industry.

 Mathematical Notation Mathematical Power Name 1018 or 1,000,000,000,000,000,000 one quintillion 1015 or 1,000,000,000,000,000 one quadrillion 1012 or 1,000,000,000,000 one trillion 109 or 1,000,000,000 one billion 106 or 1,000,000 one million 103 or 1,000 one thousand 102 or 100 one hundred 101 or 10 ten 100 or 1 one 10-1 or 0.1 one-tenth 10-2 or 0.01 one-hundredth 10-3 or 0.001 one-thousandth 10-6 or 0.000 001 one-millionth 10-9 or 0.000 000 001 one-billionth 10-12 or 0.000 000 000 001 one-trillionth 10-15 or 0.000 000 000 000 001 one-quadrillionth 10-18 or 0.000 000 000 000 000 001 one-quintillionth

 Metric Interrelationships Prefix Symbol Length, weight, or capacity Area Volume exa E 1018 1036 1054 peta P 1015 1030 1045 tera T 1012 1024 1036 giga G 109 1018 1027 mega M 106 1012 1018 hectokilo hk 105 1010 1015 myria ma 104 108 1012 kilo k 103 106 109 hecto h 102 104 106 basic unit - 1 meter, 1 gram, 1 liter 1 meter2 1 meter3 deci d 10-1 10-2 10-3 centi c 10-2 10-4 10-6 milli m 10-3 10-6 10-9 decimilli dm 10-4 10-8 10-12 centimilli cm 10-5 10-10 10-15 micro u 10-6 10-12 10-18 nano n 10-9 10-18 10-27 pico p 10-12 10-24 10-36 femto f 10-15 10-30 10-45 atto a 10-18 10-36 10-54