This is a small collection of constants that might come in handy. These were collected in the days before Google. So it is possible to obtain more accurate numbers on line. But I rather like having them in one place. Besides, they work on my old sliderule just fine!
| Constant | Abreviation | Value | Units |
| Pi | p | 3.14159265 | |
| e | e | 2.71828183 | |
| Absolute zero (0 Kelvin) | -273.160000 | Celsius | |
| Acceleration due to Earth’s gravity | a | 9.81 | metres/second² |
| Avogadro’s number | N | 6.02E-023 | molecules/mole |
| Electronic charge | e | 1.60E-019 | coulombs |
| Electron, mass of | m | 9.11E-031 | kg |
| Electron, charge/mass ratio | e/m | 1.76E+011 | coulombs/kg |
| Electron, radius of | r | 2.19E-015 | metres |
| Faraday’s Constant | F | 66487 | C/mole |
| Gas Constant | R | 8.31E+000 | j/K/mole |
| Gravitational constant | G | 6.67E-011 | Newtons metres²/kg |
| Latent heat of evaporation of water | 2.26E+006 | joules/kg | |
| Latent heat of fusion of ice | 333400 | joules/kg | |
| Mechanical equivalent of heat | 4.18 | joules/calorie | |
| Plank’s constant | h | 6.63E-034 | joules seconds |
| Velocity of sound at STP | 343.6 | metres/second | |
| Velocity of light in vacuo | c | 299792500 | metres/second |
| Radius of Planet Earth | 6378100 | metres | |
| Geostationary Orbit | 35786000 | metres |