SI_prefixes_NIST - 10-1 deci d 10-2 centi c 10-3 milli m...

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Return to Units home page Units Topics: Introduction Units Prefixes Outside Rules Background Units Bibliography Constants, Uncertainty home page SI prefixes The 20 SI prefixes used to form decimal multiples and submultiples of SI units are given in Table 5. It is important to note that the kilogram is the only SI unit with a prefix as part of its name and symbol. Because multiple prefixes may not be used, in the case of the kilogram the prefix names of Table 5 are used with the unit name "gram" and the prefix symbols are used with the unit symbol "g." With this exception, any SI prefix may be used with any SI unit, including the degree Celsius and its symbol °C. Because the SI prefixes strictly represent powers of 10, they should not be used to represent powers of 2. Thus, one kilobit, or 1 kbit, is 1000 bit and not See also prefixes for binary multiples adopted by the IEC. Table 5. SI prefixes Factor Name Symbol 10 24 yotta Y 10 21 zetta Z 10 18 exa E 10 15 peta P 10 12 tera T 10 9 giga G 10 6 mega M 10 3 kilo k 10 2 hecto h 10 1 deka da Factor Name Symbol
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Unformatted text preview: 10-1 deci d 10-2 centi c 10-3 milli m 10-6 micro 10-9 nano n 10-12 pico p 10-15 femto f 10-18 atto a 10-21 zepto z 10-24 yocto y Example 1: 10-6 kg = 1 mg (one milligram), but not 10-6 kg = 1 kg (one microkilogram) Example 2: Consider the earlier example of the height of the Washington Monument. We may write h W = 169 000 mm = 16 900 cm = 169 m = 0.169 km using the millimeter (SI prefix milli, symbol m), centimeter (SI prefix centi, symbol c), or kilometer (SI prefix kilo, symbol k). Page 1 of 2 Definitions of the SI units: The twenty SI prefixes 12/12/2007 http://physics.nist.gov/cuu/Units/prefixes.html 2 10 bit = 1024 bit. To alleviate this ambiguity, prefixes for binary multiples have been adopted by the International Electrotechnical Commission (IEC) for use in information technology. Continue to Units outside the SI Page 2 of 2 Definitions of the SI units: The twenty SI prefixes 12/12/2007 http://physics.nist.gov/cuu/Units/prefixes.html...
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This note was uploaded on 04/28/2008 for the course ME 3720 taught by Professor Lee during the Spring '08 term at Georgia Institute of Technology.

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SI_prefixes_NIST - 10-1 deci d 10-2 centi c 10-3 milli m...

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