Science Equipment

Physical constants
Technical Information
Constant Symbol Value Unit
Atomic mass unit mu 1.660540 . 10 -27 kg
Avogadro constant NA 6.022137 . 10 23 mol -1
Bohr magneton µB 9.274015 . 10 -24 JT -1
Bohr radius ao 5.291771 . 10 -11 m
Boltzmann constant kB 1.380662 . 10 -23 JK -1
Compton wavelength (e) λCe 2.426311 . 10 -12 m
Compton wavelength (n) λCn 1.319591 . 10 -15 m
Compton wavelength (p) λCp 1.321410 . 10 -15 m
Electric field constant in vacuo εo 8.854188 . 10 -12 Fm -1
Electron radius re 2.817941 . 10 -15 m
Elementary charge e 1.602177 . 10 -19 C
Faraday constant F 9.648531 . 10 4 Cmol -1
Fine structure constant α 7.297353 . 10 -3
Gas constant R 8.31451 J mol -1 K -1
Gravitation constant f 6.672590 . 10 -11 Nm 2 kg -2
Intrinsic impedance r 3.767301 . 10 2 Ω
Light velocity in vacuo c 2.997924 . 10 8 ms -1
Loschmidt constant NL 2.686763 . 10 25 m -3
Magnetic field constant in vacuo µ0 1.256637 . 10 -7 Hm -1
Molar volume of ideal gases υ 2.445294 . 10 -2 m 3 mol -1
298K, 101.325kPa
Normal acceleration of fall g 9.80665 ms -2
Planck constant h 6.626075 . 10 -34 Js
Rest mass of the electron me 9.109390 . 10 -31 kg
Rest mass of the neutron mn 1.674929 . 10 -27 kg
Rest mass of the proton mp 1.672623 . 10 -27 kg
Rational quantum h/(2)π 1.054588 . 10 -34 Js
Rydberg constant R∞ 1.097373 . 10 7 m -1
Stuart Science Equipment Catalogue Page 117