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许多学生对物质的比热容感到难以理解.比热容反映了物质的什么特性?为什么用“比热容”这三个字?比热容这个名词生活中不常用,大家感到陌生、抽象.比热容的概念涉及质量、热量、温度三个物理量,学生对定义中为什么要同时满足“每千克”和“温度上升1℃”这两个条件感到不可理解.比热容的单位为什么这么复杂?还有不会用比热容知识解释有关的生活、自然现象.为突破这个难点,建议采取下面几个层次,帮助学生理解.一、通过实验,增加感性认识可通过回忆生活经验,如把一壶水烧开要比把同样情况下半壶水烧开用的时间长,说明同样情况下,物质的质量越大,吸收的热量越多;把一壶水烧开比把一壶水烧热用的时间长,说明同样情况下,物质升高的温度越高,需要吸收的热量越多;再取质量、初温都相同的水和煤油,用同样的容器和同样的热源加
Many students feel incompatible with the specific heat capacity of matter, and what is the characteristic of specific heat capacity? Why the term “heat capacity” is not commonly used in the term “specific heat capacity.” We all feel strange and abstract, Heat, temperature, three physical quantities, students why the definition of both at the same time meet the “per kilogram” and “temperature rise 1 ℃ ” these two conditions are not understandable. Why is the unit of specific heat capacity so complicated? Specific knowledge of heat capacity to explain the life and natural phenomena in order to break through this difficulty, it is recommended to take the following levels to help students understand: First, through experiments to increase perceptual awareness through memories of life experience, such as boiling a pot of water than the Under the same circumstances, half pot of water boiled for a long time, indicating that under the same circumstances, the greater the quality of the material, the more heat absorbed; to boil a pot of water than a pot of water with heat for a long time, indicating the same In the case, the higher the temperature of the substance rises, the more heat it needs to absorb; then the same mass of water and kerosene with the same initial temperature and the same heat source