摘要
介绍了利用声速测量仪测量空气中的声速,根据声速与气体的摩尔质量、气体的比热容比之间的关系,间接测量了摩尔气体常量。首先确定了超声波换能器的最佳工作点,然后分别采用共振干涉法与相位比较法测量了声速,再根据声速与摩尔气体常量间的关系,得出了摩尔气体常量。本实验原理简单,方法可行,实验结果与标准值相比,其相对误差分别为1.93%和1.79%,相对误差较小,表明测量结果较可靠。
This paper introduces the use of sound velocity measuring apparatus in the measure of sound velocity in air.According to the relation among sound velocity,the molar mass of gas and the gas specific heat ratio,we can measure molar gas constant indirectly. First,we ensure the best action spot of ultrasonic transducer determine,then we measure the sound velocity by resonance interference method and phase comparison of velocity measurement. At last,we get the molar gas constant according to the relation between the acoustic velocity and molar gas constant. The principle of experiment is simple and the method of experiment is feasible. Because the experimental errors of two methods are1. 93% and 1. 79% respectively by comparing experimental result with the standard value,we can make sure the measuring result is reliable.
作者
刘竹琴
LIU Zhuqin(College of Physics and Electronic Information, Yanan University, Yanan 716000, Shaanxi, China)
出处
《实验室研究与探索》
CAS
北大核心
2018年第5期31-33,53,共4页
Research and Exploration In Laboratory
基金
陕西省2013年科学技术研究发展计划项目(2013K02-14)
陕西省2014年科学技术研究发展计划项目(2014K02-08-01)
关键词
声速
摩尔气体常量
气体比热容比
sound velocity
molar gas constant
gas specific heat ratio
