The aim of this paper was to present a sample teaching design of “Water Conductivity”, through digital educational video. The teaching of the thematic unit “Water Conductivity” causes difficulties and alternative conceptions to many students because of its abstract nature. The purpose of this research is twofold and results from the desire to understand the difficult perceivable concepts, a fact that is also related to the absence of the strongest teaching tool of a chemist, which is no other than the experiment.