用弦振动法测定液体密度的探讨  

Density Measurement of Liquid by String Vibration

作　　者：杨慧[1] 陈浩飞 YANG Hui;CHEN Haofei(Physics Department,Xinzhou Normal University,Xinzhou 034000,China;Shool of Mechanical Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]忻州师范学院物理系,山西忻州034000 [2]中北大学机械工程学院,山西太原030051

出　　处：《长春师范大学学报》2024年第6期40-42,共3页Journal of Changchun Normal University

基　　金：忻州师范学院院级教学改革创新项目“理论力学课程项目化教学改革研究”(JGYB202201)。

摘　　要：介绍了一种测定液体密度实验的新方法——弦振动法,该方法是根据力学实验中弦线上产生驻波创新而来的,将弦线另一端悬挂砝码放在空气中,当出现振幅较大而稳定的驻波时测量弦线的长度及驻波的数量,依次将砝码放入已知密度的液体和待测液体中,出现振幅较大且稳定的驻波时分别测量弦线的长度及驻波的数量,将数据代入公式即可得到待测液体的密度。该实验方法简单、新颖,测量结果较准确。We introduce a new experimental method for measuring liquid density:string vibration method.This innovative method is based on the generation of standing waves on the chord line in mechanical experiments.Some weights is hung on the other end of the chord line and placed in air.When a large and stable standing wave appears,the length of the chord line and the number of standing waves are measured.Then,the weights are sequentially placed into the liquid with known density and the liquid with the density to be tested.When a large and stable standing wave appears,the length of the chord and the number of standing waves are measured respectively.Finally,the data are inputted into the formula to obtain the density of the liquid to be tested.This experimental method is simple,novel,and the measurement are relatively accurate.

关 键 词：弦振动 驻波 液体密度 

分 类 号：O4-33[理学—物理]