A room $5\mathrm{.}0mx5\mathrm{.}0m$ in area and $2\mathrm{.}5m$ high, with one window of $2\mathrm{.}0m$ wide $1\mathrm{.}5m$ high, is

under fire. The fire load is $800M\frac{J}{m^2}$ floor area. The floor of the room is constructed from concrete

and the ceiling and walls are constructed from gypsum wall board. Calculate the equivalent fire

severity using:

$($a$)$ Eurocode formula

$($b$)$ CIB formula

$($c$)$ Law formula and

$($d$)$ Compare and discuss the results.

Assume the thermal properties of the materials as follows: