“液体”是高中物理的重要章节,是热学的基础内容,是高考的热点内容之一。下面结合难点,对此类题进行归纳、分析,供参考。难点一:液体的表面张力疑难解读:(1)实验探究:实验现象表明,液体的表面层好像是绷紧的橡皮膜一样,具有收缩的趋势。(2)理论分析:与气体相接触的液体的表面层中,液体分子分布比液体内部稀疏,即分子间距 “Liquid ” is an important chapter of high school physics, is the basic content of heat, is one of the hot topics of college entrance examination. The following combination of difficulties, such questions for induction, analysis, for reference. Difficult point: difficult to interpret the surface tension of the liquid: (1) Experimental Study: The experimental results show that the surface layer of liquid seems to be tightened rubber membrane, with a contraction trend. (2) Theoretical analysis: In the surface layer of the liquid in contact with the gas, the liquid molecules are sparsely distributed inside than the liquid, that is, the molecular pitch