Chemical demonstrations are very often performed in closed vessels of limited volume. This, of course, affects the duration of the demonstration. Flow chambers may be used instead, allowing for a significant increase in the time of the demonstration. Several attractive experiments (ranging from very simple to more complex) are described in this paper and are offered as either new or improved lecture demonstrations for both first-year students of chemistry and chemistry majors.
Petruševski et al. (Wed,) studied this question.