Supplemental Material: Mechanics of Style

1 For Metric Units4 Supplemental Material: Mechanics of StyleQuantityNameSymbolBase unitsamount of substancemolemolelectrical currentampereAlengthmetermluminous intensitycandelacdmasskilogramkgthermody namic temperatureakelvinKtimesecondsSupplement ary unitsplane angleradianradsolid anglesteradiansraCelsius temperature is generally expressed in degrees Celsius (symbol: C). international system (SI) Base and Supplementary UnitsFactorPrefixSymbolFactorPrefixSymbo l1018exaE10 1decid1015petaP10 2centic1012teraT10 3millim109gigaG10 5micro 106megaM10 9nanon103kilok10 12picoP102hectoh10 15femtof101dekada10 18attoaInternational system (SI) PrefixesExpression in terms QuantityNameSymbolof other unitsabsorbed dose, specific energy imparted, kerma, grayGyJ/kgabsorbed dose indexactivity (of a radionuclide)

2 BecquerelBqs 1capacitancefaradFC/VconductancesiemensS A/Vdose equivalent, dose equivalent indexsievertSvJ/kgelectric charge, quantity of electricitycoulombCA selectric potential, potential difference, electromotive voltVW/Aforce, voltageelectric resistanceohm V/Aenergy work, quantity of heatjouleJN mforcenewtonN(kg m)/s2frequencyhertzHzs 1illuminanceluxlxlm/m2inductancehenryHWb /Aluminous fluxlumenlmcd srmagnetic fluxweberWbV smagnetic flux densityteslaTWb/m2pressure, stresspascalPaN/m2radiant flux, powerwattWJ/svolume (capacity)literLdm3 international system (SI) Derived Units With Special NamesQuantityNameSymbolabsorbed dose rategray per secondGy/saccelerationmeter per second squaredm/s2angular accelerationradian per second squaredrad/s2angular velocityradian per secondrad/sareasquare meterm2concentration (amount of substance)

3 Mole per cubic metermol/m3current densityampere per square meterA/m2density, mass densitykilogram per cubic meterkg/m3electric charge densitycoulomb per cubic meterkg/m3electric field strengthvolt per meterV/melectric flux densitycoulomb per square meterC/m2energy densityjoule per cubic meterJ/m3exposure (X and rays)coulomb per kilogramC/kgheat capacity, entropyjoule per kelvinJ/Kluminancecandela per square metercd/m2magnetic field strengthampere per meterA/mmolar energyjoule per moleJ/molmolar entropy, molar heat capacityjoule per mole kelvinJ/(mol K)moment of forcenewton meterN mpermeabilityhenry per meterH/mpermittivityfarad per meterF/mpower density, heat flux density, irradiancewatt per square meterW/m2radiancewatt per square meter steradianW/(m2 sr)

4 Radiant intensitywatt per steradianW/srspecific energyjoule per kilogramJ/kgspecific heat capacity, specific entropyjoule per kilogram kelvinJ/(kg K)specific volumecubic meter per kilogramm3/kgsurface tensionnewton per meterN/mthermal conductivitywatt per meter kelvinW/(m k)velocity, speedmeter per secondm/sviscosity (dynamic)pascal secondPa sviscosity (kinematic)square meter per secondm2/svolumecubic meterm3wave numberone per meterm lOther international system (SI) Derived UnitsPhysical quantityTraditional unitSI equivalentAreaacre4, m2square m2square mm2square mile (statute) km2square m2 EnergyBritish thermal unit (IT)1, Jcalorie (IT), Jerg10 7 Jkilowatt 106 JForcedyne10 5 Nkilogram NLengthangstrom ( ) nmfoot ( international ) mmile ( statute) kmnautical mile ( international ; nmi)a1, gpound ( ) kgPowerhorsepower (electric) kWPressureatmosphere (normal)a101, Papound per square inch (psi) kPatorra(101,325/760) Pasound pressure level (SPL.)

5 Dynes/cm2)b20 N/m2 Volumecubic m3cubic cm3fluid mlquart (liquid) = international factors for these units are exact. (For conversion factors that are not exact, the precision with which the quantity was measureddetermines the number of decimal places.) bA decibel value is a measure of the power of sound relative to a specific reference most common reference level on which decibel values are based is at 20 N/m2. If decibel values are based on another referencelevel, specify the level. Also, always indicate how frequencies were weighted: If frequencies were equally weighted, write SPL ( , soundpressure level) in parentheses after the decibel value; if frequencies were unequally weighted, specify the standard weighting used( , A, B, or C) in parentheses after the decibel of Conversions to international system (SI) Equivalents