“比热”是初三物理学中的一个重要概念，也是教学中的难点之一。毫无疑问，做好比热演示实验是初中学生理解和掌握比热这一概念的关键所在。为此，笔者设计制作了如附图所示的演示比热实验装置。装置中用两个质量相同、容积都为25OmL的锥形瓶，分别装质量相等的水（80mL）和煤 “Specific heat” is an important concept in the third year of physics, and it is also one of the difficulties in teaching. There is no doubt that doing specific heat experiments is the key to junior high school students’ understanding and mastery of the concept of specific heat. For this reason, the author designed and produced a demonstration specific heat experimental device as shown in the drawing. Two Erlenmeyer flasks with the same mass and volume of 25OmL were used in the device, and the water (80mL) and coal with equal mass were separately installed.