 by Nikolai V. Shokhirev

## Walker group units of measures

### Introduction

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 well-defined 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.

### SI units

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.

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