Define the following terms: $(i)$ Rigidity,$(ii)$ Compressibility,and $(iii)$ Density. Compare any two states of matter on the basis of the above-defined properties.

(A) $(i)$ Rigidity: The property of matter to maintain its shape even when an external force is applied.
$(ii)$ Compressibility: The property of matter by virtue of which its particles can be brought closer to each other by applying external pressure.
$(iii)$ Density: The mass per unit volume of a substance,defined as $\text{Density} = \frac{\text{Mass}}{\text{Volume}}$.

Property	Solid	Liquid	Gas
Rigidity	Rigid	Fluid	Fluid
Compressibility	Negligible	Very low	High
Density	High	Less than solids	Least