=m m- steradian For radial (circular)frequency and fo lar velocity the unit rad s, or simply s-, should be used, and this may not be simplified to Hz. The unit Hz should be used only for frequen in the sense of cycles per second. 2The Celsius temperature 8 is defined by the equation: The SI unit of Celsius temperature interval is the degree Celsius, C, which is equal to the kelvin, K.C should be treated as a single symbol, with no space between the sign and the tter C (The symbol K, and the symbolo, should no longer be used. Units in Use Together with the Si These units are not part of the Sl, but it is recognized that they will continue to be used in appropriate contexts. SI prefixes may be attached to some of these units, such as milliliter, ml; millibar, mbar; megaelectronvolt Mev; kilotonne. ktonne Symbol ume 60s ume ume (π/10800)rad 10-m2 L onne e x =1.60218×10-19J unified atomic u(=a(C)/12) =1. x 10-kg The angstrom and the bar are approved by CIPM for"temporary use with SI units, until CIPM makes a further recommendation. However, they should The values of these units in terms of the ending si units are not exact, since they depend on the values of the <periment 3The unified atomic mass unit is also sometimes called the dalton with symbol Da, although the name and symbol have not been approved by CGPm. Conversion Constants and Multipliers Recommended Decimal Multiples and Submultiples submultiple abols submultiples Prefixes E micro u(Greek mu e 2000 by CRC Press LLC© 2000 by CRC Press LLC Units in Use Together with the SI These units are not part of the SI, but it is recognized that they will continue to be used in appropriate contexts. SI prefixes may be attached to some of these units, such as milliliter, ml; millibar, mbar; megaelectronvolt, MeV; kilotonne, ktonne. Conversion Constants and Multipliers Recommended Decimal Multiples and Submultiples plane angle radian rad 1 = m m–1 solid angle steradian sr 1 = m2 m–2 1 For radial (circular) frequency and for angular velocity the unit rad s–1, or simply s–1, should be used, and this may not be simplified to Hz. The unit Hz should be used only for frequency in the sense of cycles per second. 2 The Celsius temperature q is defined by the equation: q/°C = T/K – 273.15 The SI unit of Celsius temperature interval is the degree Celsius, °C, which is equal to the kelvin, K. °C should be treated as a single symbol, with no space between the ° sign and the letter C. (The symbol °K, and the symbol °, should no longer be used.) Physical Symbol quantity Name of unit for unit Value in SI units time minute min 60 s time hour h 3600 s time day d 86 400 s plane angle degree ° (p/180) rad plane angle minute ¢ (p/10 800) rad plane angle second ² (p/648 000) rad length ångstrom1 Å 10–10 m area barn b 10–28 m2 volume litre l, L dm3 = 10–3 m3 mass tonne t Mg = 103 kg pressure bar1 bar 105 Pa = 105 N m–2 energy electronvolt2 eV (= e ¥ V) ª1.60218 ¥ 10–19 J mass unified atomic mass unit2,3 u (=ma(12C)/12) ª1.66054 ¥ 10–27 kg 1 The ångstrom and the bar are approved by CIPM for “temporary use with SI units,” until CIPM makes a further recommendation. However, they should not be introduced where they are not used at present. 2 The values of these units in terms of the corresponding SI units are not exact, since they depend on the values of the physical constants e (for the electronvolt) and Na (for the unified atomic mass unit), which are determined by experiment. 3 The unified atomic mass unit is also sometimes called the dalton, with symbol Da, although the name and symbol have not been approved by CGPM. Multiples and Multiples and submultiples Prefixes Symbols submultiples Prefixes Symbols 1018 exa E 10–1 deci d 1015 peta P 10–2 centi c 1012 tera T 10–3 milli m 109 giga G 10–6 micro m (Greek mu) Name of Symbol for Expression in Physical quantity SI unit SI unit terms of SI base units