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Flammable limits:
Flammability limits refer to the range within which an exothermic chemical reaction is possible when an
external ignition source is introduced to a variety of materials at different oxygen, density, mixtures,
storage conditions, and accelerants. Flammability limits are expressed in terms of fuel concentration at a
specific pressure and/or temperature. Explosive limits usually refer to the range of pressure and
temperature for which an explosive reaction for a specific substance at specific conditions is possible.
The composition must be within the flammable range to reach its explosive limits. When the explosive
limits are reached, the composition and start it exothermic reaction with autocatalytic ignition, though
external input such as flame can start the reaction it isn’t required for the chemical reaction to start,
unlike when a composition is at its flammable limit it is not autocatalytic and requires external input
such as flame or direct heat. With all substances there is a range of their limits, where there is not
enough oxygen or too much oxygen to burn. The point at which there is too much oxygen is called the
upper flammability limit, or the upper Explosive limit. The point at which there is too little oxygen to
burn is the lower flammability limit, or the lower explosive limit.