Physical Constants
Sponsored Links
For full table - rotate the screen!
| Description | Symbol | Formula | Value1 | Unit1 | Value2 | Unit2 |
|---|---|---|---|---|---|---|
| Absolute zero, temperature | 0 | K | -273.15 | oC | ||
| Acceleration of gravity at earth's surface | g | 9.81 | m/s2 | 32.2 | ft/s2 | |
| Atmospheric pressure at sea level | 1.01325×105 | N/m2 | 14.69 | lb/in2 | ||
| Atomic mass unit | 1.660540×10-27 | kg | 1.000 | u | ||
| Avogadro's constant | NA | 6.022141×1023 | mol-1 | |||
| Base of natural logaritms | e | 2.718 281 828... | ||||
| Base of natural logaritms | lnx | 2.3026 log(x) | ||||
| Bohr magneton | μB | e h/4πme | 9.274009994×10-24 | Am2 | 5.788381×10-5 | eV/T |
| Bohr radius | a0 | ε0h2/π mee2 | 5.2917721067×10-11 | m | 2.08×10-9 | in |
| Boltzmann constant | k | R/NA | 1.38064852×10-23 | J/K | 8.617330×10-5 | eV/K |
| Charge of electron | e | 1.602176×10-19 | C | |||
| Faraday constant | F | e NA | 9.648533289×104 | C/mol | 26.801 | Ah/mol |
| Fine structure constant | α | 7.29720×10-3 | ||||
| Gas constant (molar, ideal) | R | 8.3144598 | J/molK | 82.057338 | cm3atm/molK | |
| Gravitational constant | G | 6.67408×10-11 | m3/kg s2 | |||
| Mass of electron (rest mass) | me | 9.10938356×10-31 | kg | 5.485799×10-4 | u | |
| Mass of neutron | mn | 1.67492747×10-27 | kg | 1.008664915 | u | |
| Mass of proton | mp | 1.67262190×10-27 | kg | 1.007276466 | u | |
| Permeability of a vacuum | μ0 | 4p×10-7 | kg m/s2A2 | |||
| Permittivity of a vacuum | ε0 | 1/μ0 c02 | 8.854187817×10-12 | C2/Nm2 | A2s4/kg m3 | |
| Planck's constant | h | 6.626070040×10-34 | J s | 4.135667×10-15 | eV s | |
| Radiation constant, first | C1 | 2 π h c2 | 3.741844×10-16 | Wm2 | ||
| Radiation constant, second | C2 | h c/k | 1.438833×10-2 | mK | ||
| Ratio of a circle's circumference(C) to its diameter | π | C/d | 3.141592653… | |||
| Rydberg constant | R∞ | mee4/8ε02h3c0 | 1.097373156×107 | m-1 | ||
| Speed of light in vacuum | c0 | 2.99792458×108 | m/s | |||
| Stefan-Boltzmann constant | σ | 5.670367×10-8 | W/m2K4 | 11.7×10-8 | cal/cm2dayK4 | |
| Volume ideal gas, 1 atm, 0°C | Vm | 22413.6 | cm3/mol | 22.4136 | liter/mol | |
| Volume ideal gas,1 atm, 25°C | Vm | 24466.1 | cm3/mol | 1.0244651 | m3/mol |
Sponsored Links
Related Topics
• Basics
Basic engineering data. SI-system, unit converters, physical constants, drawing scales and more.
Related Documents
Constants of π
The mathematical π constants.
Constants of e
The mathematical e constants.
Inorganic Compounds in Water - Melting and Boiling Temperature, Density and Solubility
Physical constants for more than 280 common inorganic compounds. Density is given for the actual state at 25°C and for liquid phase at melting point temperature.
Materials - Light Reflecting Factors
Light reflecting factor materials.
Numerical Constants
Some numerical constants.
Refractive Index common Liquids, Solids and Gases
Some common fluids and their refractive index.
Solar System Constants
Properties and data for the Sun, the Earth and the Moon.
Sponsored Links