A comparative study of two tracer gases: SF6 and N2O

This study compares the characteristics of two tracer gases — sulphur hexafluoride (SF6), and nitrous oxide (N2O) — whose densities are different from that of air (i.e. 5.11 and 1.53, respectively). The study is based on exclusively experimental work; and concerns the behaviour of the two gases with regard to their distribution and dispersion in an experimental cell, incorporating into the comparison method an index that is intended to characterise the ventilation of an enclosed space, namely ventilation effectiveness, εC.