(4) The victim is at least 13 but less than 16 years old and the actor is at least four years older than the victim. Sexual assault is a crime of the second degree. Amended amended 1979, c.178, s.26; 1983, c.249, s.2; 1989, c.228, s.3; 1997, c.194, s.1.
Quick Answer. Pressure is exerted by fluids because of their weight. According to Georgia State University, static fluid pressure is exerted by the depth of the fluid, the density of the fluid and the acceleration of gravity.
Increasing the pressure on an incompressible fluid produces zero volume (or density) change. That is, the the partial derivative of volume (V) by pressure (p) is zero. This is a property of the fluid (not the flow) and is applicable for hydrostatics (zero velocity) as well as hydrodynamics (fluid motion). The fluid compressibility is related to the speed-of-sound (c) which becomes infinite in an incompressible fluid.