University:
California State University, Northridge
Course:
MSE 227 | Engineering Materials
Academic year:

2022
Views:

259

Pages:

1
Author:

Hallie Randolph

Values of Selected Physical Constants Quantity Symbol SI Units cgs Units Avogadro’s number NA Boltzmann’s constant k 6.022 ⫻ 10 molecules/mol 1.38 ⫻ 10⫺23 J/atom # K Bohr magneton Electron charge Electron mass Gas constant Permeability of a vacuum Permittivity of a vacuum Planck’s constant mB e — R m0 ⑀0 h 9.27 ⫻ 10⫺24 A # m2 1.602 ⫻ 10⫺19 C 9.11 ⫻ 10⫺31 kg 8.31 J/mol # K 1.257 ⫻ 10⫺6 henry/m 8.85 ⫻ 10⫺12 farad/m 6.63 ⫻ 10⫺34 J # s Velocity of light in a vacuum c 3 ⫻ 108 m/s 6.022 ⫻ 1023 molecules/mol 1.38 ⫻ 10⫺16 erg/atom # K 8.62 ⫻ 10⫺5 eV/atom # K 9.27 ⫻ 10⫺21 erg/gaussa 4.8 ⫻ 10⫺10 statcoulb 9.11 ⫻ 10⫺28 g 1.987 cal/mol # K unitya unityb 6.63 ⫻ 10⫺27 erg # s 4.13 ⫻ 10⫺15 eV # s 3 ⫻ 1010 cm/s a b 23 In cgs-emu units. In cgs-esu units. Unit Abbreviations A ⫽ ampere in. ⫽ J⫽ K⫽ kg ⫽ lbf ⫽ lbm ⫽ m⫽ Mg ⫽ mm ⫽ mol ⫽ MPa ⫽ Å ⫽ angstrom Btu ⫽ British thermal unit C ⫽ Coulomb ⬚C ⫽ degrees Celsius cal ⫽ calorie (gram) cm ⫽ centimeter eV ⫽ electron volt ⬚F ⫽ degrees Fahrenheit ft ⫽ foot g ⫽ gram inch joule degrees Kelvin kilogram pound force pound mass meter megagram millimeter mole megapascal N nm P Pa s T ␮m newton nanometer poise Pascal second temperature micrometer (micron) W ⫽ watt psi ⫽ pounds per square inch SI Multiple and Submultiple Prefixes Factor by Which Multiplied 9 10 106 103 10⫺2 10⫺3 10⫺6 10⫺9 10⫺12 a Avoided when possible. ⫽ ⫽ ⫽ ⫽ ⫽ ⫽ ⫽ Prefix Symbol giga mega kilo centia milli micro nano pico G M k c m ␮ n p

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