Cool Flame 3
Cool Flame 3 : Certain vapours or gases are able to propagate flame in mixtures richer than those within the normal ranges of flammability. These rich mixtures or cool flame ranges may be ignited at temperatures much lower than their normal ignition temperatures whilst the flame that they propagate is colourless in daylight and blue in darkness. Thus is it possible in certain cases for too rich mixtures to find a means of ignition and then to propagate flame back to concentrations within the normal ranges of flammability, explosions then occurring. The vapours of most endothermic flammable liquids such as carbon disulphide and ether may behave in this manner and similarly the vapour orally hydrocarbon with more than four atoms of carbon in the molecule may experience the same phenomenon. Variations in pressure affect cool flame ranges. Concerning ether, its normal range of flammability corresponds to 1. 7 to 15% of the vapour in air, whilst its cool flame range corresponds to 15% to 48% of its vapour in air
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