题目内容
气体温度计结构如图所示。玻璃测温泡A内充有理想气体,通过细玻璃管B和水银压强计相连。开始时A处于冰水混合物中,左管C中水银面在O点处,右管D中水银面高出O点
=14cm。后将A放入待测恒温槽中,上下移动D,使C中水银面仍在O点处,测得D中水银面高出O点
=44cm。(已知外界大气压为1个标准大气压,1标准大气压相当于76cmHg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241341331803159.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134133195794.png)
①求恒温槽的温度。
②此过程A内气体内能 (填“增大”或“减小”),气体不对外做功,气体将 (填“吸热”或“放热”)。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134133086345.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134133117361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241341331803159.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134133195794.png)
①求恒温槽的温度。
②此过程A内气体内能 (填“增大”或“减小”),气体不对外做功,气体将 (填“吸热”或“放热”)。
(1)
(2)增大;吸热
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134133242646.png)
①(6分)设恒温槽的温度为T2,由题意知T1=273K
A内气体发生等容变化,根据查理定律得
①
②
③
联立①②③式,代入数据得
(或91℃)
②(4分)增大;吸热
A内气体发生等容变化,根据查理定律得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134133304593.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134133336521.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134133398541.png)
联立①②③式,代入数据得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134133242646.png)
②(4分)增大;吸热
![](http://thumb2018.1010pic.com/images/loading.gif)
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