“热和能”是热学的重点内容,也是中考的热点.这部分知识涉及的考点有:分子热运动的知识,内能,改变内能的两种方式和热量的概念,比热容的定义、单位和物理意义,热传递过程中吸收或放出的热量的计算,机械能和内能的相互转化,热机中能的转化,燃料热值和燃料完全燃烧时放出热量的计算,热机中能量的效率问题等. “Hot and can ” is the focus of the heat content is also a hot spot in the exam.This part of the knowledge involved in the test are: knowledge of molecular thermal motion, internal energy, internal energy to change the two ways and the concept of heat, the definition of specific heat capacity , Unit and physical meaning, calculation of heat absorbed or released during heat transfer, mutual conversion of mechanical energy and internal energy, conversion of energy in heat engine, calorific value of fuel and calculation of heat released during complete combustion of fuel, energy efficiency in heat engine Problems and so on.