Gas Explosion

 It may be a deflagration or detonation. it totally depend on the flame speed which can be greater than or less than the speed of sound in the unburned fuel air mixture.

In deflagration and detonation Peak pressure and the form of pressure time loading are fundamentally different . In detonation Peak pressure generated are at least twice as large as those of deflagration. Pressures generated in gas or dust deflagrations in buildings are often of the order of 1 psig because most building structures will fail at pressures of that order of magnitude

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