EFא ١١٦ אאא א אא AppendixEFא Physical Constantsאאא אא א − 273.15 °C 0K א absolute zero temperature acceleration due to gravity at sea level (Washington d. c.) 9.801 m / s 2 אאא אא אא 6.022 × 10 23 particles / mole NO Avogadro’s number − 1.6022 × 10 −19 C e charge of an electron 8.988 × 10 9 N . m 2 / kg 2 K constant in Coulomb’s 6.673 × 10 −11 N .m 2 / kg 2 G gravitational constant אא 9.109 × 10 −31 kg me mass of an electron א 1.673 × 10 −27 kg mp mass of a proton h Planck’s constant 2.99792458 × 10 8 m / s ( exact ) c speed of light in a vacuum 1.67492 × 10 −27 kg mn mass of neutron 8.85 × 10 −12 F / m εo permittivity of space 4π × 10 −7 T .m / A µo permeability constant 6.626 × 10 −34 J / Hz 4.136 × 10 −15 eV . s א א א א אא אא Conversion Factorsא 1.661 × 10 −27 kg = 931.5 MeV / c 2 = atomic mass unitאא١ 1.602 × 10 −19 J = electronvolt١ 1 N .m = Joule١ 1 V .C = Joule١ 6.242 × 10 18 × ( elementary ch arg e units ) = coulomb١ J٨٧‐