改进电热法测定氯化钠溶液比热容的研究  

Study on Using Improved Electrothermal Method to Test Specific Heat Capacity of Sodium Chloride Solution

作　　者：付睿丽 马镛[1] 李磊[1] 吴修治 

机构地区：[1]河海大学,江苏南京210098

出　　处：《工程与试验》2014年第1期55-58,共4页Engineering and Test

基　　金：江苏省高等学校大学生实践创新训练计划(201310294010Y)

摘　　要：改进电热法测定比热容装置,省去电流表,用阻值恒定的FeCrAl合金电阻丝代替,并且设置静音搅拌叶轮,实现溶液自动搅拌。为防止氯化钠溶液电解,用石墨电极代替传统铜电极,测出氯化钠溶液比热容随浓度的变化规律:即在初温相同的条件下,氯化钠溶液比热容随浓度增加而线性降低;随着初始温度的升高,氯化钠溶液比热容随浓度变化曲线整体向上平移。The experimental device,by which the improved electrothermal method is used to test the specific heat capacity,may leave out an ammeter,and the ammeter can be replaced by the resistance wire of FeCrAl Alloy which has constant resistance.The device has mute stirring impel-ler,and can mix the solution automatically.In order to prevent the sodium chloride solution from being electrolysed,the traditional copper electrode is replaced by graphite electrode.Then,the variations of the specific heat capacity of sodium chloride solution with the temperature are tested.The results of the experiment indicate that the specific heat capacity of sodium chloride solution decreases linearly along with the increase of concentration,and with the changes of the initial temperature,the curve offset slightly.

关 键 词：比热容 浓度 电热法 自动搅拌 线性 

分 类 号：O482.21[理学—固体物理]