小学４年生「もののあたたまり方」における「水の移動」の一考察―水の移動と温度分布の経時変化を合わせた観察によって捉えられる，温められて（冷やされて）上昇（下降）する水の周りにある水の移動に注目して―

抄録

In thermal convection of water, the movement of water as a whole includes movement of not only heated water but also the motion of the water that surrounds it. It is conceivable that confusion between the movement of water and the transfer of heat is caused by not paying attention to the movement of water around the heated water. In this study, we created a teaching tool that can observe time-dependent changes of both temperature and flow velocity distributions simultaneously and clarify the movement of water around heated water. In addition, the case of a cooling experiment was similarly clarified. Two particular flows were observed in the region of water around heated water: the “movement of water that rises with the upward flow generated from the heating part” and the “movement of flowing water such that it fills the area where there was a heating part-generated upward flow.” Similarly, in the case of cooling, the “movement of water around cooled water” was revealed. By using this teaching tool in the unit “Heat Transfer in Matter” of fourth-grade elementary science, it is expected that confusion between heat transfer and movement of water can be prevented.