On the liquefaction of ozone, and on its color in the gaseous state

MM.P. Hautefeuille, J. Chappuis
1880 Journal of the Franklin Institute  
Ozone, as commonly prepared, possesses in oxygen so small a tension, 53 mm. at most, that its physical properties are scarcely known and distinguished from those of oxygen. We know the difficulties which M. Soret ha~ so skillfiitly~overeome in determining the density of ozone by operating upon oxygen slightly ozonized. Among the physical constants of this body it~ formatlon-heat has been accurately determined by M. Berthelot, notwithstanding tile degree of dilution in which it occurs when
more » ... t occurs when issuing from the efttllve apparatus. Tl}e preparation of a mixture very rich in ozone is the first condition to be fulfilled in order to acquire new notions concerning this curious substance. We have formerly established that the isomeric transformation of oxygen submitted to the electric efftuve follows simple laws, and that tile proportion of ozone increases very little with the pressure for each temperature, whilst it is quintupled in passing from 20 ° to --55 ° . If withdrawn from the action of the electric discharges the mixture of ozone and oxygen ceases to be a homogeneous system in equilibrium. Neverthelessthe mixture remaius without appreciable alteration during the whole time that a constant temperature is maintained, operating below 0 °. This relative stability of ozone has enabled us to compress the mixture, and to obtain tensions of ozone of several atmospheres. As it is necessary to prepare the ozone designed for these experiments at the' highesg tension possible, oxygen must:be ozonized at a very low temperature. Consequently it is kept for a quarter of an hour in an apparatus for alternative discharges, the slender concentric :glass tubes of which are phmged in methyl-chloride ; then it is caused to pass into the cylinder terminated by a capillary tube of Cailletet's apparatus. This reservoir, of abou~ 60 ce. capacity, originally a vacuum, and kept at --23 °, cannot be filled at once under a pressure borderi,g upon 760 ram., and is rapidly connected 5 times in succession with the effluve apparatus, the 'capacity of which cannot exceed 20 cc. In an hour and a quarter we succeed by this'means in filling
doi:10.1016/0016-0032(80)90117-9 fatcat:vcrasm2tlbgaplnht6ltffchnq