Unit of force is written as, kgms−2.
Now, torque can be written as, τ=Fs therefore its unit can be written as kgm2s–2.
Pressure is given by, P=AF, therefore unit of pressure will be kgm−1s−2.
Now, pressure gradient is given by ratio of pressure and distance, so its unit will be kgm−2s−2.
Impulse is given by product of force and time, so its unit will be kgms−1.
As we know unit of torque and energy is the same, therefore energy density can written as =volumeenergy=kgm−1s–2.