Densities of an air-like binary mixture (0.2094 oxygen + 0.7906 nitrogen, mole fractions) were measured along six isotherms over the temperature range from 100 K to 298.15 K at pressures up to 8.0 MPa, using a low-temperature single-sinker magnetic suspension densimeter. The measurements were carried out at T = (100, 115, and 130) K in the homogeneous gas and liquid region, and at T = (145, 220, and 298.15) K in the supercritical region (critical temperature T_C = 132.35 K); in total, we present results for 52 (T, p) state points. The relative expanded combined uncertainty (k = 2) of the experimental densities was estimated to be between 0.03 % and 0.13 %, except for four values near the critical point. The largest error is caused by the magnetic suspension coupling in combination with the mixture component oxygen, which is strongly paramagnetic; the resulting force transmission error is up to 1.1 %. However, this error can be corrected with a proven correction model to an uncertainty contribution in density of less than 0.044 %. Due to a supercritical liquefaction procedure and the integration of a special VLE-cell, it was possible to measure densities in the homogeneous liquid phase without changing the composition of the liquefied mixture. Moreover, saturated liquid and saturated vapor densities were determined at T = (100, 115, and 130) K by extrapolation of the experimental single-phase densities to the saturation pressure. The new experimental results were compared with the mixture model of Lemmon et al. for the system (nitrogen + argon + oxygen) and the GERG-2008 equation of state.

使用低温单沉降器磁悬浮，在 100 K 至 298.15 K 的温度范围内，在 100 K 至 298.15 K 的温度范围内，测量了类空气二元混合物（0.2094 氧 + 0.7906 氮，摩尔分数）的密度密度计。测量是在执行Ť  =（100，115和130）K均相气体和液体区域中，并且在Ť  =（145，220和298.15）K在该超临界区域（临界温度Ť _Ç  = 132.35ķ ); 总的来说，我们展示了 52 个（T，p）状态点的结果。相对扩展组合不确定度 ( k = 2) 的实验密度估计在 0.03 % 和 0.13 % 之间，除了临界点附近的四个值。最大的误差是由磁悬浮耦合与混合成分氧结合引起的，它是强顺磁性的；由此产生的力传递误差高达 1.1%。但是，可以使用经过验证的校正模型来校正此误差，使密度的不确定性贡献小于 0.044 %。由于超临界液化程序和特殊 VLE 单元的集成，可以在不改变液化混合物的组成的情况下测量均相液相中的密度。此外，饱和液体和饱和蒸气密度在T = (100, 115, 和 130) K 通过将实验单相密度外推到饱和压力。新的实验结果与 Lemmon等人的混合模型进行了比较。对于系统（氮 + 氩 + 氧）和 GERG-2008 状态方程。