This study compares the characteristics of two tracer gases - sulphur hexaf
luoride (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 excl
usively experimental work; and concerns the behaviour of the two gases with
regard to their distribution and dispersion in an experimental cell, incor
porating into the comparison method an index that is intended to characteri
se the ventilation of an enclosed space, namely Ventilation effectiveness,
epsilon (C). (C) 2000 Elsevier Science Ltd. All rights reserved.