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Copyright © 2008 by Eni Generalic

PHYSICAL CONSTANTS

Absolute zero
-273.15 °C

Acceleration of free fall, standard
9.80665 m/s²

Atomic mass unit
1.6605402×10^-27 kg

Avogadro constant
6.0221367×10²³ 1/mol

Base of natural logarithms
2.718281828

Boltzmann constant
1.380658×10^-23 J/K

Classical electron radius
2.81794092×10^-15 m

Electron mass
9.1093897×10^-31 kg

Electron-proton mass ratio
5.44617013×10^-4

Electronvolt
1.6021892×10^-19 J

Elementary charge
1.60217733×10^-19 C

Faraday constant
96485.309 C/mol

First radiation constant
3.7417749×10^-16 W m²

Molar gas constant
8.314510 J/mol K

Molar volume
(Ideal gas, T = 273.15 K, p = 101.325 kPa)
0.02241410 m³/mol

Newtonian constant of gravitation
6.67259×10^-11 N m²/kg²

Permeability of vacuum
12.566370614×10^-7 N/A²

Permittivity of vacuum
8.854187817×10^-12 F/m

PI
3.1415926535897932

Planck constants
6.6260755×10^-34 J s

Second radiation constant
0.01438769 m K

Solar constant
1400 W/m²

Speed of light in vacuum
299792458 m/s

Speed of sound in air at STP
340 m/s

Standard pressure
101325 Pa

Hint: To get Pi (π) or Avogadro's number click on the 'Constants' button and go down to the one you want.