Mathematical and other constants
- Updated 2022-09-21 13:20 UTC
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 |