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- PV=nRT
- Pressure is increasing due to the
burning of materials in the structure.
- The structures volume is staying
constant.
- The temperature is increasing due to
the fire.
- As the fire uses all the oxygen within
the structure by the burning of the
materials, the gases become too rich.
Reaching beyond their upper flammable
limit (UFL) and breaking the fire
tetrahedron. Once new oxygen is brought
into the structure by a window breaking or
a door being opened, the fire tetrahedron
is completed again. Allowing the gases to
be in their flammability limit but since
so much of this gas has built up within
the structure. An explosion is what
occurs.
- According to Fire Engineering: normal
oxygen level is 21% once below 14%,
visible flame will be reduced.
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