Lakeshore Learning Materials 642 - Manual (Page 122)

Lake Shore Model 642 Electromagnet Power Supply User’s Manual
B-2 Units for Magnetic Properties
Table B-2. Recommended SI Values for Physical Constants
Quantity Symbol Value (SI units)
Permeability of Vacuum µ
0 4 π × 10 -7 H m -1
Speed of Light in Vacuum c 2.9979 × 10 8 m s -1
Permitivity of Vacuum ε
0
= (µ
0
c 2 ) -1 8.8542 × 10 -12 F m -1
Fine Structure Constant, µ0ce2/2h
α
α -1
0.0073
137.0360
Elementary Charge e 1.6022 × 10 -19 C
Plank's Constant
h
h = h/2 π
6.6262 × 10 -34 J Hz -1
1.0546 × 10 -34 J s
Avogadro's Constant N
A
6.0220 × 10 23 mol -1
Atomic Mass Unit 1 u = 10 -3 kg mol -1 /N
A
1.6605 × 10 -27 kg
Electron Rest Mass m
e
0.9109 × 10 -30 kg
5.4858 × 10 -4 u
Proton Rest Mass m
p
1.6726 × 10 -27 kg
1.0073 u
Neutron Rest Mass m
n
1.6749 × 10 -27 kg
1.0087 u
Magnetic Flux Quantum
φ = h/2e
h/e
2.0679 × 10 -15 Wb
4.1357 × 10 -15 J Hz -1 C -1
Josephson Frequency-Voltage Ratio 2e/h 483.5939 THz V -1
Quantum of Circulation
h/2m
e
h/m
e
3.6369 × 10 -4 J Hz -1 kg -1
7.2739 × 10 -4 J Hz -1 C -1
Rydberg Constant R
∞
1.0974 × 10 7 m -1
Proton Moment in Nuclear Magnetons
µ
p
/µ
N 2.7928
Bohr Magneton µ
B
= eh/2m
e
9.2741 × 10 -24 J T -1
Proton Gyromagnetic Ratio γ
p
2.6752 × 10 8 s -1 T -1
Diamagnetic Shielding Factor, Spherical H
2
O Sample 1 + σ (H
2
O) 1.0000
Molar Mass Constant R 8.3144 J mol -1 K -1
Molar Volume, Ideal Gas (T
0
= 273.15K, p
0
= 1 atm) V
m
= RT
0
/p
0
0,0224 m 3 mol -1
Boltzman Constant k = R/N
A
1.3807 × 10 -23 J K -1
Stefan-Boltzman Constant σ = ( π 2 /60) k 4 /h 3 c 2 5.6703 × 10 -8 W m -2 K -4
First Radiation Constant c
1
= 2 π hc 2 3.7418 × 10 -16 W m -2
Second Radiation Constant c
2
= hc/k 0.0144 mK
Gravitation Constant G 6.6720 × 10 -11 N m 2 kg -2
Data (abbreviated to 4 decimal places) from CODATA Bulletin No. 11, ICSU CODATA Central Office, 19 Westendstrasse,
6 Frankfurt/Main, Germany. Copies of this bulletin are available from this office.