Conductivity is an important parameter of industrial liquids.  Conductivity is measured for liquids almost all liquids.  The conductivity of the liquid gives an idea of the ions in the liquid.

The conductivity of a liquid is measured using special conductivity sensors.  The unit of conductivity is siemen/cm.  A siemen is 1/ohm.  The unit of conductance is sometimes referred to mho (ohm written in reverse).

The conductance is usually a very low value for conducting liquids such as water.  It will be of the order of a millionth of a siemen, in microsiemens.  Highly pure water, for instance, will have a conductivity of 1microsiemen/cm.

Measurement of conductivity
Conductivity is measured by measuring the conductivity of a liquid between two electrodes whose area and distance between each other is fixed.  This is known as a cell constant.

A cell constant of 1 implies that the electrodes will have a surface area of 1 cm2 and will be spaced 1 cm apart.