- Home
- Reference
- Education
- Directories
- Job Board
- Ask The Experts
- Science Supplies
- eGreetings
- Fun
- About Us
Welcome to PhysLink.com - Your physics and astronomy online portal. Stay a while! Check out our extensive library of educational and reference materials. Also, check out our fun section!
Fundamental Physical Constants
| Values given below are from the CODATA 1998 recommended by the National Institute of Standards and Technology of United States (NIST). Values contain the (uncertainty) in the last two decimal places given in brackets. Values that do not have this uncertainty listed are exact. For example: | ||
| mu | = 1.66053873(13) x 10-27 kg | |
| mu | = 1.66053873 x 10-27 kg | |
| Uncertainty in mu | = 0.00000013 x 10-27 kg | |
| Name | Symbol | Value |
| Atomic Mass Unit | mu | 1.66053873(13) x 10-27 kg |
| Avogadro's Number | NA | 6.02214199(47) x 1023 mol-1 |
| Bohr Magneton |  B | 9.27400899(37) x 10-24 J T-1 |
| Bohr Radius | ao | 0.5291772083(19) x 10-10 m |
| Boltzmann's Constant | k | 1.3806503(24) x 10-23 J K-1 |
| Compton Wavelength |  c | 2.426310215(18) x 10-12 m |
| Deuteron Mass | md | 3.34358309(26) x 10-27 kg |
| Electric Constant |  o | 8.854187817 x 10-12 F m-1 |
| Electron Mass | me | 9.10938188(72) x 10-31 kg |
| Electron-Volt | eV | 1.602176462(63) x 10-19 J |
| Elementary Charge | e | 1.602176462(63) x 10-19 C |
| Faraday Constant | F | 9.64853415(39) x 104 C mol-1 |
| Fine Structure Constant |  | 7.297352533(27) x 10-3 |
| Hartree Energy | Eh | 4.35974381(34) x 10-18 J |
| Hydrogen Ground State | 13.6057 eV | |
| Josephson Constant | Kj | 4.83597898(19) x 1014 Hz V-1 |
| Magnetic Constant | o | 4 x 10-7 |
| Molar Gas Constant | R | 8.314472(15) J K-1 mol-1 |
| Natural Unit of Action |  | 1.054571596(82) x 10-34 J s |
| Newtonian Constant of Gravitation | G | 6.673(10) x 10-11 m3 kg-1 s-2 |
| Neutron Mass | mn | 1.67492716(13) x 10-27 kg |
| Nuclear Magneton | n | 5.05078317(20) x 10-27 J T-1 |
| Planck Constant | h | 6.62606876(52) x 10-34 J s h = 2 |
| Planck Length | lp | 1.6160(12) x 10-35 m |
| Planck Mass | mp | 2.1767(16) x 10-8 kg |
| Planck Time | tp | 5.3906(40) x 10-44 s |
| Proton Mass | mP | 1.67262158(13) x 10-27 kg |
| Rydberg Constant | RH | 10 9.73731568549(83) x 105 m-1 |
| Stefan Boltzmann Constant |  | 5.670400(40) x 10-8 W m-2 K-4 |
| Speed of Light in Vacuum | c | 2.99792458 x 108 m s-1 |
| Thompson Cross Section | e | 0.665245854(15) x 10-28 m2 |
| Wien Displacement Law Constant | b | 2.8977686(51) x 10-3 m K |
Source:
CODATA Recommended Values of the Fundamental Physical Constants: 1998
by Peter J. Mohr and Barry N. Taylor
National Institute of standards and Technology, Gaithersburg, MD 20899-8401
Related Websites
- NIST Fundamental Constants
AMAZING! - International System of Units
In-depth information on the SI, the modern metric system - Uncertainty of Measurement Results
Guidelines for the expression of uncertainty in measurement - eFunda - Online Reference for Engineers
eFunda provides extensive Unit Conversion, Equations, and Material Data of value to engineers.
Search
Loading
Sponsors
Science Quote
'As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality.'Albert Einstein
(1879-1955)
Deal of the Day
Volcano Lamp
Regular Price: $29.99
Today's Price: $20.00
Watch this lamp create a realistic-looking volcanic display! Buy it now! Deal ends at midnight!
Top Selling
Here are our physics & astronomy bestsellers:
Solar Science Kit
Mini Plasma Ball
Glow-in-the-Dark Jar of Stars
Deluxe 3D Mirascope
Deluxe Water Rocket Set
Revolving Multi-Color Fiberoptic Light
Worlds Strongest Magnets
Solar System Planetarium 4M Kit
Potato Clock 4M Kit
Windmill Generator 4M Kit