Appendix
Physical Constants
Physical Constants
| CONSTANT | SYMBOL | VALUE |
|---|---|---|
| Angstrom | Å | 1Å= 10−8=10−1 nm |
| Avogadro constant | NA | 6.022 × 1023 particles/mole |
| Boltzmann constant | k | 1.38 × 10−8J/°K = 8.617 × 10−5 eV/°K |
| Gas constant | R | 1.987 cal/mole °K |
| Electronic charge | q | 1.602 × 10−19 coulomb |
| Electron mass | mc | 9.11 × 10−28 g |
| Permittivity in vacuum | ε0 | 8.85 × 10−14 F/cm |
| Planck constant | h | 6.626 × 10−34 Joule-sec |
| Speed of light | c | 2.998 × 1010 cm/sec |
Selected Conversions
1 Atm = 1.013 × 106 dynes/cm2 = 1.013 × 105 Pa = 1.013 × 105 N/m2
1 Torr = 1 mm Hg = 133.3 Pa
1 Bar = 0.987 Atm = 750 Torr
10l0 dynes/cm2 = 109 N/m2 = 109 Pa = 146000 psi
1 erg = 1 dyne-cm = 10−7 Joule
1 eV = 1.602 × 10−12 erg = 1.602 × 10−19 Joule
1 cV/atom = 23060 ...
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