The melting point of pure liquid ozone has been determined by two methods and found to be —192.5±0.4°C. The surface tension of pure ozone at —182.7°C is 38.1±0.2 dynes/cm. Densities of pure liquid ozone are as follows: 1.5727±0.0004 g/cm3 at —182.9°C, 1.5839±0.0011 g/cm3 at —185.6°C, and 1.6130±0.0004 at —195.6°C, the last value being for the super-cooled liquid. The viscosity of pure liquid ozone is 1.56±0.2 centipoises at —183.0°C and 4.14±0.5 centipoises for the supercooled liquid at —195.6°C. Densities of several liquid ozone-oxygen mixtures have been measured. These measurements show that densities of liquid mixtures can be calculated accurately from densities of pure oxygen and ozone by the relation 1/d = x1/d1+x2/d2, where d is the density of the mixture, d1 and d2 are the densities, and x1 and x2 the weight fractions of pure oxygen and pure ozone, respectively, at the given temperature. Viscosities of ozone oxygen mixtures have been measured at —183.0°C and can be reproduced with an average deviation of 5% by the relation log10η=x1 log10η1+x2 log10η2, where η represents the viscosity of the mixture, η1 the viscosity of liquid oxygen, η2 the viscosity of liquid ozone, and x1 and x2 are the mole fractions of oxygen and ozone, respectively, all at the same temperature.
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