$3$ kg or $6\mathrm{.}6$ lbs of biomass with an energy content of $17\mathrm{.}2$ MJ$/$kg $(7,411$ Btu$/$lb$)$ was torrefied at $300$ degrees C$.$ The resulting $2\mathrm{.}25$ kg of biomass $(4\mathrm{.}95$ lbs$)$ that was left over had an energy content of $18\mathrm{.}5$ MJ$/$kg $(7,971$ Btu$/$lb$).$ Determine the energy densification for this torrefaction process.