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A microsiemens (Î¼S) is a decimal fraction of the SI unit of electrical conductance and admittance siemens and is equal to 10â»â¶ siemens. Conductance and admittance are the reciprocals of resistance and impedance respectively, hence one siemens is equal to the reciprocal of one ohm. micromho (Î¼â§) is a decimal fraction of the mho, which is the alternative name of the SI unit of electric conductance and admittance siemens, the reciprocal of one ohm. Mho is derived from spelling ohm backwards and is written with an upside-down capital Greek letter Omega â§. 1 Î¼â§ = 10â»â¶ â§.
The unit of measurement for conductivity is expressed in either microSiemens (uS/cm) or micromhos (umho/cm) which is the reciprocal of the unit of resistance, the ohm. The prefix micro means that it is measured in millionths of a mho. MicroSiemens and micromhos are equivalent units. Distilled water has a range of conductivity from 0.5 to 2 uS/cm. Drinking water is generally between 50 to 1500 uS/cm and domestic wastewater may have conductivities above 10,000 uS/cm.