中文摘要：

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时，质量摩尔浓度分别为0．648、3．700（无杂质）和3．700（含杂质）mol／kg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0．1～6．0MPa内纯水的比定压热容，与NIST值相比的相对偏差绝对平均值为0．41％。

英文摘要：

Isobaric heat capacities of boric acid solution at the impurities） and 3. 700 mol/kg （containing impurities） were calorimeter at temperatures of 303-396 K and pressures of concentrations of 0. 648, 3. 700 （no measured using high accuracy flow 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, pure water at temperatures of 296-396 K and pressures from atmosphere to and the measured average relative deviation from the NIST literature values isobaric 6.0 MP is withi heat capacities of a were measured, n 0. 41%.