Abstract This paper presents speed of sound measurements in heavy water (deuterium oxide, D 2 O ) along six isotherms between 276.97 K and 363.15 K for pressures up to 210 MPa using a double pulse-echo method. The experimental apparatus was validated measuring the speed of sound in ordinary water at ambient pressure and at temperatures between 295.5 K and 363.15 K with results found in agreement with values calculated from the reference equation of state for water by Wagner and Pruβ within 0.005%. The relative combined expanded uncertainty of our speed of sound measurements, at a confidence level of 95%, is estimated to be less than 0.03% for pressures up to 10 MPa and in the order of 0.05% for pressures up to 210 MPa in the whole investigated temperature range. The speed of sound results have been compared with values calculated from the reference equation for heavy water the IAPS84 Formulation by Hill et al. (1982), and with the prediction of the newly developed equation of state for heavy water by Herrig et al. (2018). The relative deviations of these comparison were found to be consistent with the reference equations within their combined uncertainty. The results presented here were also compared with the most recent data by Wegge et al. and found to be in agreement within 0.05%.

中文翻译：

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在 (276.97 和 363.15) K 之间的温度和高达 210 MPa 的压力下，氧化氘 (D2O) 中的声速测量

摘要 本文介绍了在压力高达 210 MPa 的情况下，使用双脉冲回波方法沿 276.97 K 和 363.15 K 之间的六个等温线测量重水（氧化氘，D 2 O）中的声速。该实验装置在环境压力和 295.5 K 和 363.15 K 之间的温度下测量普通水中的声速进行了验证，发现结果与 Wagner 和 Pruβ 根据水的参考状态方程计算的值一致，误差在 0.005% 以内。我们的声速测量的相对组合扩展不确定性，在 95% 的置信水平下，估计对于高达 10 MPa 的压力小于 0.03%，对于高达 210 MPa 的压力总体而言约为 0.05%调查的温度范围。声速结果已与根据 Hill 等人的 IAPS84 配方重水参考方程计算得出的值进行了比较。(1982)，以及 Herrig 等人对新开发的重水状态方程的预测。(2018)。发现这些比较的相对偏差在其组合不确定度内与参考方程一致。此处提供的结果还与 Wegge 等人的最新数据进行了比较。并发现一致在 0.05% 以内。此处提供的结果还与 Wegge 等人的最新数据进行了比较。并发现一致在 0.05% 以内。此处提供的结果还与 Wegge 等人的最新数据进行了比较。并发现一致在 0.05% 以内。