by Nikolai V. Shokhirev
Introduction
SI units
Basic interactions
Dimensions and units
Numeric values of the fundamental constants
Energy Units
Magnetic resonance in SI units
This page was originally developed as reference data for Dr. Walker Research Group.
The large variety of the units of measures used in different areas and in different times causes a great deal of confusion. Obviously any particular set of units can be recalculated to another. This can be done if we have welldefined standard units and reliable conversion factors. Below we use the SI system of units as a standard. Note that the SI units are not necessarily the most convenient in some specific areas.
For basic definition and details visit the site A Dictionary of Units of Measurement by
Russ Rowlett: http://www.unc.edu/~rowlett/units/index.html
and National Institute of Standards and Technology http://physics.nist.gov/
Base quantity  Symbol  Name  Unit 
Basic units  
Length  L  meter  m 
Mass  M  kilogram  kg 
Time  T  second  s 
Electric current  I  ampere  A 
Thermodynamic temperature  K  kelvin  K 
Amount of substance  mole  mol  
Luminous intensity  candela  cd  
Derived units  
Frequency  hertz  Hz = s^{ 1}  
Force  F  newton  N = m·kg·s^{ 2} 
energy, work, quantity of heat  E  joule  J = N·m = m^{ 2}·kg·s^{ 2} 
Power  watt  W = J/s = m^{ 2}·kg·s^{ 3}  
Pressure  P  pascal  Pa = N/m^{ 2} = m^{ 1}·kg·s^{ 2} 
Electric charge, quantity of electricity  Q  coulomb  A s 
Electric potential difference, electromotive force  V  volt 
V = W/A = m^{ 2}·kg·s^{ 3}·A^{ 1} 
Capacitance  C  farad  F = C / V = m^{ 2}·kg^{ 1}·s^{ 4}·A^{ 2} 
Electric resistance  ohm  = V / A = m^{ 2}·kg·s^{ 3}·A^{ 2}  
Electric conductance 

siemens  S = A/V = m^{ 2}·kg^{ 1}·s^{ 3}·A^{ 2} 
magnetic flux  weber  Wb = V·s = m^{ 2}·kg·s^{ 2}·A^{ 1}  
magnetic flux density  B  tesla  T = Wb/m^{ 2} = kg·s^{ 2}·A^{ 1} 
Inductance  henry  H = Wb/A = m^{ 2}·kg·s^{ 2}·A^{ 2} 
The basic physical interactions are presented in the next section.
©Nikolai Shokhirev, 20012005
Please email me at nikolai@shokhirev.com 