The electronic conductivity of purified distilled water in electrochemical laboratory settings at room temperature is often between 0.05 and 1 μS/cm. Environmental influences during the peparation of salt solutions as gas absorption due to storing the water in an unsealed beaker may immediately increase the conductivity from  and lead to values between 0.5 and 1 .   <br>
When distilled water is heated during the preparation of salt solutions, the conductivity increases even without adding salt. This is often not taken into account.
In a typical experiment under the fume hood in an unsealed beaker the conductivity of purified water increases typically non linearly from values below 1 μS/cm to values close 3.5 μS/cm at . This temperature dependence has to be taken into account particularly in dilute salt solutions.