Fundamental Constants Constant Avogadro's constant Boltzmann's constant Molar gas constant Electronic charge Faraday constant Planck's constant Permittivity of free space 1 Mass of 12 of 12C atom* Mass of hydrogen atom Mass of electron Gravitational constant Standard gravity Speed of light in vacuum *
Symbol NA, NO k, kB ¼ R/NA R ¼ N Ak e F ¼ N Ae h (Z ¼ h/2p)
3o
u mH me G g c
SI
CGS 23
1
6.022 10 mol 1.381 1023 J K1 8.314 J K1 mol1 1.602 1019 C 9.649 104 C mol1 6.626 1034 J s 8.854 1012 C2 J1 m1 1.661 1027 kg 1.673 1027 kg 9.109 1031 kg 6.674 1011 N m2 kg2 9.80665 m s2 (N kg1) 2.998 108 m s1
6.022 1023 mole1 1.381 1016 erg/deg 8.314 107 erg/mole-deg 4.803 1010 esu 9.649 104 C/mole 6.626 1027 erg sec 1 1.661 1024 gm 1.673 1024 gm 9.109 1028 gm 6.674 108 cm3/gm-sec2 980.665 cm/sec2 2.998 1010 cm/sec
Atomic mass unit (also denoted by a.m.u. and a.u.), which is also the modern unit of molecular weight, the Dalton (Da).
Intermolecular and Surface Forces
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Intermolecular and Surface Forces Third Edition Jacob N. Israelachvili UNIVERSITY OF CALIFORNIA SANTA BARBARA , C ALIFORNIA, USA
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