PROBLEM TO BE SOLVED: To solve problems in which the heating/warming method in a conventional science experiment of an elementary school uses a hot water reserving container serving as a heating source without a lid, so that a teacher proceeds to each team where the hot water is cooled down sequentially, while boiling hot water for replacement in a large amount because the cooling is fast, and performs the work to pour more boiling water while removing cold water many times per team, and thereby most of the teacher's attentiveness has to be cut for this work, and further an important liquid temperature desired to warm or keep a certain temperature is hard to become an aimed temperature due to a high temperature of hot water of the heating source.;SOLUTION: A lid 2 of a roofed plastic container of 6-7 liters in capacity having heat retaining property is provided with a peak-shaped pleat 7 on the side surface so that a depth where a beaker 4 receiving the liquid to be warmed is soaked in hot water for heating is freely changed, and a taper shaped hole 3 slightly tightened is provided.;COPYRIGHT: (C)2015,JPO&INPIT
展开▼
