  Thermodynamics of ideal Fermi gas trapped in an external generic power law
potential $U=\sum_{i=1} ^d c_i |\frac{x_i}{a_i}|^{n_i}$ are investigated
systematically from the grand thermodynamic potential in $d$ dimensional space.
These properties are explored deeply in the degenerate limit ($\mu>> K_BT$),
where the thermodynamic properties are greatly dominated by Pauli exclusion
principle. Pressure and energy along with the isothermal compressibilty is non
zero at $T=0K$, denoting trapped Fermi system is quite live even at absolute
zero temperature. The nonzero value of compressibilty denotes zero point
pressure is not just a constant but depends on volume.
