The negative sign indicates the volume decreases as pressure increases. As in the limit as then

                                                               L - 4.2

Since the equation can be rearranged as

                                                            L - 4.3
Dimension :-
                    Unit :-

Typical values:-
                    Air - 1.03 x 10 5 N/m²
                    water  at standard temperature and pressure as compared to that of Mild steel .

The above typical values show that the air is about 20,000 times more compressible than water while water is about 100 times more compressible than mild steel.