2. What's the difference between immediate and delayed inflammation?

Following a leak of a flammable product, there are three possible scenarios:

• The mixture ignites immediately.

• The mixture ignites with a delay.

• The mixture does not ignite.

Immediate ignition leads preferentially to the phenomenon of fire for flammable liquids and to the phenomenon of a flaming jet for flammable gases. Delayed ignition leads preferentially to explosion phenomena, with pressure effects of greater or lesser magnitude, depending on the bulkiness of the medium in which the leak occurs (UVCE or VCE). If there is no ignition, the flammable mixture will disperse.

The figure "Consequences associated with the ignition of a flammable product release" associates the expected hazardous phenomena with the three...