On a method of measuring the viscosity of the vapours of volatile liquids, with an application to bromine

Abstract

The determination of several of the physical properties of the halogens is rendered difficult by reason of their great chemical activity. This is particularly the case where pressure measurements are involved, it being almost impossible to choose a gauge fluid which is unacted upon by these elements. It was in order to surmount this difficulty that the following method was devised, and this paper deals with its application to the determination of the viscosity of gaseous bromine at various temperatures. It will be seen that in the apparatus used the only possibility of chemical action is between the bromine at various temperatures. It will be seen that in the apparatus used the only possibility of chemical action is between the bromine and the glass, and the author has been given to understand that this does not occur to any appreciable extent. Although originally designed for the purpose of avoiding chemical action, the method to be described appears to form a very suitable means of determining the saturation vapour of any volatile liquid, the only data required being the saturation vapour pressures over a small temperature range and the densities of the liquid over the same range.