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Chapter 31 Appendix G: Physical Constants and Conversion Factors
| Selected Physical Constants | |
|---|---|
| Atomic mass unit | 1 amu = 1.6605389 × 10−24 g |
| 1 g = 6.022142 × 1023 amu | |
| Avogadro’s number | N = 6.022142 × 1023/mol |
| Boltzmann’s constant | k = 1.380651 × 10−23 J/K |
| Charge on electron | e = 1.6021765 × 10−19 C |
| Faraday’s constant | F = 9.6485338 × 104 C/mol |
| Gas constant | R = 0.0820575 (L atm)/(mol K) |
| = 8.31447 J/(mol K) | |
| Mass of electron | me = 5.485799 × 10−4 amu |
| = 9.109383 × 10−28 g | |
| Mass of neutron | mn = 1.0086649 amu |
| = 1.6749273 × 10−24 g | |
| Mass of proton | mp = 1.0072765 amu |
| = 1.6726217 × 10−24 g | |
| Pi | π = 3.1415927 |
| Planck’s constant | h = 6.626069 × 10 −34J s |
| Speed of light (in vacuum) | c = 2.99792458 × 108 m/s (exact) |
| Useful Conversion Factors and Relationships | |
|---|---|
| Length | Energy (derived) |
| Si unit: meter (m) | Si unit: joule (J) |
| Mass | Pressure (derived) |
| SI unit: kilogram (kg) | SI unit: pascal (Pa) |
| Temperature | Volume (derived) |
| Si unit: kelvin (K) | SI unit: cubic meter (m 3 ) |