A manometric method for density of liquids at low temperatures is described and applied to liquid ozone. Results in g cm−3: 1.571 at −183°C, 1.595 at −188°C, and 1.614 at −195°C with an average deviation from the mean of ±0.003. A simple method of test for magnetic susceptibility of low temperature liquid is described and used to detect residual oxygen in liquid ozone. Vacuum distilled liquid ozone is shown to contain less than 0.1 percent oxygen.
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Brown et al. (1953) studied this question.