Conductivity is the inverse of resistivity. The resistance
of a material is given by R = V/I, or the voltage V that should be applied across the
material to create a current I that flows through it. Resistance is measured in
Ohms.
Conductivity of a material is given by I/V, or it is
the current I that flows through the material when a voltage V is applied across it.
Conductivity is measured in Siemens.
The conductivity of
water depends on its purity and the type of impurities dissolved in it. The conductivity
of ocean water is approximately 53 mS/cm. City water which does not too many dissolved
impuroties has a conductivity of 50 µS/cm.
Pure water has a
conductivity of .055 µS/cm
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