| | ||
| Symbol | Details | Value (MKS) |
|---|---|---|
| | ||
| c | Speed of light in vacuum | 2.99792458 x 108 ms-1 |
| h | Planck's Constant | 6.6260755(40) x 10-34 Joule-s |
| k | Boltzmann's Constant | 1.380658(12) x 10-23 JouleK-1 |
| e | Elementary Charge | 1.60217733(49) x 10-19 Coulomb |
| m | Electronic Mass | 9.1093897(54) x 10-31 kg |
| m | Mass of a proton | 1.6726231(10) x 10-27 kg |
| m | Mass of a neutron | 1.6749286(10) x 10-27 kg |
| m | Mass of a Hydrogen atom | 1.6735 x 10-27 kg |
| G | Gravitational Constant | 6.67259(85) x 10-11 New m2 kg-2 |
| NA | Avogadro's Constant | 6.0221367 x 1023 mol-1 |
| amu | Atomic Mass Unit | 1.6605402(10) x 10-27 kg |
| | Fine Structure Constant | 7.29735308(33) x 10-3 |
| R | Rydberg Constant | 10973731.534(13) m-1 |
| ao | Bohr's Radius | 0.529177249(24) x 10-10 m |
| h / (mc) | Compton Wavelength of electron | 2.42631058(22) x 10-12m |
| | Thomson Cross-section | 0.66524616(18) x 10-28m2 |
| e2 / (mc2) | Classical Electron Radius | 2.81794092 x 10-15 m |
| R | Molar Gas Constant | 8.314510(70) Joule mol-1 K-1 |
| | Stefan-Boltzmann Constant | 5.67051(19) x 10-8 Joule m-2s-1K-4 |
| | ||
| | ||
| Symbol | Details | Value |
|---|---|---|
| | ||
| A.U. | Astronomical Unit | 1.49 x 1011 m |
| pc | Parsec | 3.09 x 1016 m |
| l.y. | Light Year | 9.46 x 1015 m |
| Msun | Solar Mass | 1.989 x 1030 kg |
| Rsun | Solar Radius | 6.96 x 108 m |
| Lsun | Solar Luminosity | 3.83 x 1026 Joule s-1 |
| ME | Mass of Earth | 5.97 x 1024 kg |
| RE | Equatorial Radius of Earth | 6378.1 km |
| Earth-Moon distance | 384403 km | |
| MM | Mass of Moon | 7.35 x 1022 kg |
| RM | Radius of Moon | 1738 km |
| | ||