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International System of Units Introduction SI Base Units SI Derived

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International System of Units Introduction SI Base Units SI Derived International System of Units Introduction This is a brief summary of the SI, the modern metric system of measurement. Long the language universally used in science, the SI has become the dominant language of international commerce and trade. These "essentials" are adapted from NIST Special Publication 811 (SP 811), prepared by B. N. Taylor and entitled Guide for the Use of the International System of Units (SI), and NIST Special Publication 330 (SP 330), edited by B. N. Taylor and entitled The International System of Units (SI). Users requiring more detailed information may access SP 811 and SP 330 online from the Bibliography, or order SP 811 for postal delivery. Information regarding the adoption and maintenance of the SI may be found in the section International aspects of the SI. SI base units The SI is founded on seven SI base units for seven base quantities assumed to be mutually independent, as given in Table 1. Table 1. SI base units Base quantity Name Symbol length meter m mass kilogram kg time second s electric current ampere A Thermodynamic kelvin K temperature amount of substance mole mol luminous intensity candela cd SI derived units Other quantities, called derived quantities, are defined in terms of the seven base quantities via a system of quantity equations. The SI derived units for these derived quantities are obtained from these equations and the seven SI base units. Examples of such SI derived units are given in Table 2, where it should be noted that the symbol 1 for quantities of dimension 1 such as mass fraction is generally omitted. Table 2. Examples of SI derived units Derived quantity Name Symbol area square meter m2 volume cubic meter m3 speed, velocity meter per second m/s acceleration meter per second squared m/s2 wave number reciprocal meter m-1 mass density kilogram per cubic meter kg/m3 specific volume cubic meter per kilogram m3/kg current density ampere per square meter A/m2 magnetic field strength ampere per meter A/m amount-of-substance mole per cubic meter mol/m3 concentration luminance candela per square meter cd/m2 kilogram per kilogram, which mass fraction may be represented by the kg/kg = 1 number 1 For ease of understanding and convenience, 22 SI derived units have been given special names and symbols, as shown in Table 3. Table 3. SI derived units with special names and symbolsTable Expression Expression Symbol in terms of in terms of Derived quantity Name other SI units SI base units plane angle radian (a) rad - m·m-1 = 1 (b) steradian solid angle sr (c) - m2·m-2 = 1 (b) (a) frequency hertz Hz - s-1 force newton N - m·kg·s-2 pressure, stress pascal Pa N/m2 m-1·kg·s-2 energy, work, joule J N·m m2·kg·s-2 quantity of heat power, radiant flux watt W J/s m2·kg·s-3 electric charge, quantity of coulomb C - s·A electricity electric potential difference, volt V W/A m2·kg·s-3·A-1 electromotive force capacitance farad F C/V m-2·kg-1·s4·A2 electric resistance ohm V/A m2·kg·s-3·A-2 electric conductance siemens S A/V m-2·kg-1·s3·A2 magnetic flux weber Wb V·s m2·kg·s-2·A-1 magnetic flux tesla T Wb/m2 kg·s-2·A-1 density inductance henry H Wb/A m2·kg·s-2·A-2 degree Celsius temperature °C - K Celsius luminous flux lumen lm cd·sr (c) m2·m-2·cd = cd m2·m-4·cd = I1 lux lx lm/m2 m-2·cd activity (of a becquerel Bq - s-1 radionuclide) absorbed dose, specific energy gray Gy J/kg m2·s-2 (imparted), kerma dose equivalent (d) sievert Sv J/kg m2·s-2 catalytic activity katal kat s-1·mol (a)The radian and steradian may be used advantageously in expressions for derived units to distinguish between quantities of a different nature but of the same dimension; some examples are given in Table 4. (b) In practice, the symbols rad and sr are used where appropriate, but the derived unit "1" is generally omitted. (c) In photometry, the unit name steradian and the unit symbol sr are usually retained in expressions for derived units. (d) Other quantities expressed in sieverts are ambient dose equivalent, directional dose equivalent, personal dose equivalent, and organ equivalent dose. Note on degree Celsius. The derived unit in Table 3 with the special name degree Celsius and special symbol °C deserves comment. Because of the way temperature scales used to be defined, it remains common practice to express a thermodynamic temperature, symbol T, in terms of its difference from the reference temperature T0 = 273.15 K, the ice point. This temperature difference is called a Celsius temperature, symbol t, and is defined by the quantity equation t= T- T0. The unit of Celsius temperature is the degree Celsius, symbol °C. The numerical value of a Celsius temperature t expressed in degrees Celsius is given by t/°C = T/K - 273.15. It follows from the definition of t that the degree Celsius is equal in magnitude to the kelvin, which in turn implies that the numerical value of a given temperature difference or temperature interval whose value is expressed in the unit degree Celsius (°C) is equal to the numerical value of the same difference or interval when its value is expressed in the unit kelvin (K). Thus, temperature differences or temperature intervals may be expressed in either the degree Celsius or the kelvin using the same numerical value. For example, the Celsius temperature difference t and the thermodynamic temperature difference T between the melting point of gallium and the triple point of water may be written as t = 29.7546 °C = T = 29.7546 K. The special names and symbols of the 22 SI derived units with special names and symbols given in Table 3 may themselves be included in the names and symbols of other SI derived units, as shown in Table 4. Table 4. Examples of SI derived units whose names and symbols include SI derived units with special names and symbols Derived quantity Name Symbol dynamic viscosity pascal second Pa·s moment of force newton meter N·m surface tension newton per meter N/m angular velocity radian per second rad/s radian per second angular acceleration rad/s2 squared heat flux density, watt per square meter W/m2 irradiance heat capacity, entropy joule per kelvin J/K specific heat capacity, joule per kilogram J/(kg·K) specific entropy kelvin specific energy joule per kilogram J/kg thermal conductivity watt per meter kelvin W/(m·K) energy density joule per cubic meter J/m3 electric field strength volt per meter V/m coulomb per cubic electric charge density C/m3 meter coulomb per square electric flux density C/m2 meter permittivity farad per meter F/m permeability henry per meter H/m molar energy joule per mole J/mol molar entropy, molar joule per mole kelvin J/(mol·K) heat capacity exposure (x and rays) coulomb per kilogram C/kg absorbed dose rate gray per second Gy/s radiant intensity watt per steradian W/sr watt per square meter radiance W/(m2·sr) steradian catalytic (activity) katal per cubic meter kat/m3 concentration SI prefixes The 20 SI prefixes used to form decimal multiples and submultiples of SI units are given in Table 5. Table 5. SI prefixes Factor Name Symbol Factor Name Symbol 1024 yotta Y 10-1 deci d 1021 zetta Z 10-2 centi c 1018 exa E 10-3 milli m 1015 peta P 10-6 micro µ 1012 tera T 10-9 nano n 109 giga G 10-12 pico p 106 mega M 10-15 femto f 103 kilo k 10-18 atto a 102 hecto h 10-21 zepto z 101 deka da 10-24 yocto y 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. Example 1: 10-6 kg = 1 mg (one milligram), but not 10-6 kg = 1 µkg (one microkilogram) Example 2: Consider the earlier example of the height of the Washington Monument. We may write hW = 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). 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 210 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. Units outside the SI Certain units are not part of the International System of Units, that is, they are outside the SI, but are important and widely used. Consistent with the recommendations of the International Committee for Weights and Measures (CIPM, Comité International des Poids et Mesures), the units in this category that are accepted for use with the SI are given in Table 6. Table 6.
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