An exploration of the surface tension of water - Is there a real so-called horizontal plane?

The paper is a sharing of real practical teaching experience for some grade-6 gifted students to hunt the definition of horizontal plane. The researcher created 5 experiments concerning the knowledge of surface tension of water by ways of motivation of orientation, exploration of problem, explicitness of hands-on experiment and the conclusion of learning. In view of the conflict between the pre-concept and result of experiment, it obviously appears that students would rather believe the results what they observed with experiment than rely on what they have learned with reading or hearing. It’s deeply impressed by some contests when the experiments conducted. The paper aims at providing the elementary students with the exploration of misconception and a proper way of what the surface tension of water is.