研究型教学方法在测量液氮比汽化热实验中的应用

Research-oriented teaching in measuring the latent heat of vaporization of liquid nitrogen

在传统的测量液氮比汽化热实验内容和方法的基础上,采用研究型教学方法,引导学生在实验中主动观察实验现象,发现液氮容器内液面高度对实验结果有较大影响.依靠国家教学示范中心的优质资源,学生重新制定实验方案,对实验内容做更进一步研究,用多块铜块集中对不同液面高度的液氮汽化情况分批测量,确定了测量液氮比汽化热时液氮容器内合适的液面高度区间.

Based on the traditional experiment of measuring the latent heat of vaporization of liquid nitrogen,a research-oriented teaching method was introduced to guide students to observe actively the experimental process,and find the influence of the liquid level in the container on the final results.By studying the vaporization process of liquid nitrogen under different liquid level,the suitable experimental conditions could be found.By the aid of the high-quality teaching resources of the National Demonstration Teaching Center,the research-oriented teaching method could lead the students to make new experimental plans and do further research on the experiment.Finally,the better teaching effect was realized.