Standard Gas Mixture Production Based on the Diffusion Method

Abstract

The vapour diffusion behaviour through glass capillary tubes was studied aiming at the production of a standard composition gas mixture. The diffusion rates were quantified by means of gravimetric measurements, taking into account the various problems inherent in the glass material weighing. Some parameters of the well-known diffusion equation were rechecked because of a lack of studies in this field. The carrier gas flow was found to play a fundamental role, although it is not ordinarily considered. The array's geometrical significance was also demonstrated. Some general procedural suggestions concerning the development of gas mixture systems are proposed.