“不同物质的比热不同”演示实验的改进

• 作 者: 马元璐
• 机 构: 上海市南汇县大团中学,
• 出 处: 物理教学
• 发表日期: 1990年06期
• 关键词: 中学物理课 受热面积 液体质量 锥形瓶 演示效果 石棉网 学生思路 加热时间 底面积 海市南汇县

初级中学物理课本第二册《比热》一节中有一《不同物质的比热不同》的演示实验(课本第62页图3-1)。在做这个演示实验时,由于烧杯内液体质量相对来说比较大,(如果烧杯内液体装得太少,则温度计的玻璃泡跟液体不能充分接触,会影响测温的准确性;而换用小烧杯,则会减小受热面积,液体吸热少,也会延长加热时间),

There is a demonstration experiment of “Different Specific Heat of Different Substances” in the second volume of Physics textbook for junior middle school (Special Heat) (text 3-1 on page 62). In this demonstration experiment, because the liquid quality in the beaker is relatively large, (if the liquid in the beaker is too little, the glass bulb of the thermometer cannot fully contact with the liquid, which will affect the accuracy of temperature measurement; Small beakers will reduce the heated area, the liquid will absorb less heat, and it will also extend the heating time)