Water does have a bulk modulus; it will compress a " little " bit.
12.
Indeed, it leads to a negative bulk modulus in the limit where the pressure tends to infinity.
13.
While hard materials have high bulk moduli, a high bulk modulus does not mean a material is hard.
14.
Correspondingly, its bulk modulus is extremely high, reported between and, which rivals that of diamond ( ).
15.
Inelastic characteristics must be considered as well, and shear modulus might even provide a better correlation with hardness than bulk modulus.
16.
But since the bulk modulus of water is non-linear with pressure, the real pressure is probably much much higher.
17.
The restoring force, which acts to return the medium to its original position, is provided by the medium's bulk modulus.
18.
If these negative responses are large enough to compensate the background fluid, one can have both negative effective bulk modulus and negative effective density.
19.
Researchers from Wuhan University, China in a paper in 2007 reported such a metamaterial which simultaneously possessed a negative bulk modulus and mass density.
20.
Bulk modulus and mass density determine the spatial dimensions of the cloak, which can bend any incident wave around the center of the shell.
