我想知道是怎么回事...
我想知道是怎么回事
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由热容、比热容的定义，1）比热容与热容的关系 C=mc；2）热容 C=dQ/dT由热力学第一定律（U2-U1=Q+W），有dQ=dU-dW对于定压过程，有dW=-pdV则dQ=dU+pdV由焓的定义H=U+pVC=dH/dT定压比热c=dH/mdT可以看出，定压过程中吸收的热量等于焓的增量。定压比热也就是单位质量温度升高1K时焓的增量。
本回答被提问者采纳热膨胀仪器生产厂家有很多，包括德国耐驰热分析、德国林赛斯热分析、北京恒久实验设备有限公司、美国TA仪器、上海众路实业有限公司等。建议您在选择热膨胀仪器生产厂家时，需要考虑设备的性能、技术、价格、售后服务等多个因素，综合比较和评估不同厂家的产...
点击进入详情页本回答由林赛斯（上海）科学仪器有限公司提供在压强不变的情况下，单位质量的某种物质温度升高1℃所需吸收的热量，叫做该种物质的“定压比热容”，用符号Cp表示，国际制单位是：J/(kg·k)。因为气体在压强不变的条件下，当温度升高时，气体一定要膨胀而对外作功，除升温所需热量外，还需要一部分热量来补偿气体对外所作的功，因此，气体的定压比热容比定容比热容要大些。由于固体和液体在没有物态变化的情况下，外界供给的热量是用来改变温度的，其本身体积变化不大，所以固体与液体的定压比热容和定容比热容的差别也不太大。
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