Definition and description :
Conductivity of a substance is defined as 'the ability or power to conduct or transmit heat, electricity, or sound'. Its units are Siemens per meter [S/m] in SI and millimhos per centimeter [mmho/cm]
Typical conductivity of waters :
Ultra pure water 5.5 · 10 6 S/m
Drinking water 0.005 – 0.05 S/m
Sea water 5 S/m