Mathematical and other constants
This is a small collection of constants that might come in handy. These were collected in the days before search engines. 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!
Pi | p | 3.141592653589793 | |
Euler's number | e | 2.718281828459045 | |
Absolute zero (0 Kelvin) | -273.15 | Celsius | |
Acceleration due to Earth's gravity | g | 9.80665 | metres/second² |
Avogadro's number | N_A | 6.02214076e23 | molecules/mole |
Elementary charge | e | 1.602176634e-19 | coulombs |
Electron, mass of | m_e | 9.1093837015e-31 | kg |
Electron, charge/mass ratio | e/m | 1.759 × 1011 | coulombs/kg |
Electron, radius of | r_e | 2.818 × 10-15 | metres |
Faraday's Constant | F | 96485.33212 | C/mole |
Gas Constant | R | 8.314462618 | joules/(K·mole) |
Gravitational constant | G | 6.674 × 10-11 | Newtons metres²/kg² |
Latent heat of evaporation of water | 2257000 | joules/kg | |
Latent heat of fusion of ice | 333000 | joules/kg | |
Mechanical equivalent of heat | 4.184 | joules/calorie | |
Planck's constant | h | 6.62607015e-34 | joules seconds |
Velocity of sound at STP | 343 | metres/second | |
Velocity of light in vacuo | c | 2.998 × 108 | metres/second |
Radius of Planet Earth | 6371000 | metres | |
Geostationary Orbit | 35786000 | metres |