不同浓度配比硼酸溶液比定压热容的实验测量
Experimental measurement of isobaric heat capacity of boric acid solutionat

采用高精度的流动型量热法测量了温度在303~396K、压力在0.1~0.5MPa范围内,浓度分别为7000ppm、40000ppm(无杂质)和40000ppm(含杂质)三种配比硼酸溶液的比定压热容。实验系统的温度、压力、比定压热容的测量不确定度分别小于±0.05K、±18kPa、±0.28%。为了验证实验系统的测量精度和可靠性,测量了温度为296~396K、压力为0.1~6MPa范围内纯水的比定压热容,与NIST文献值相比的相对偏差绝对平均值为0.41%。
Isobaric heat capacities of boric acid solution at the concentrations of 0.648,3.700 (no impurities) and 3.700 mol/kg(containing impurities) were measured using high accuracy flow calorimeter at temperatures of 303~396 K and pressures of 0.1~0.5 MPa. The uncertainties of temperature, pressure, and isobaric haet capacity were less than ±0.05 K, ±18 kPa and ±0.28 %, respectively. In order to evaluate the reliability of the experimental system, isobaric heat capacities of pure water at temperatures of 296~396 K and pressures from atmosphere to 6 MPa were measured, and the measured average relative deviation from the NIST literature values is within 0.41%.