 For example, an 8 gram projectile at 360 m/s impacting a NIJ level II vest over the sternum can produce an estimated pressure wave level of nearly 2.0 MPa (280 psi) in the heart and a pressure wave level of nearly 1.5 MPa (210 psi) in the lungs.Impacting over the liver can produce an estimated pressure wave level of 2.0 MPa (280 psi) in the liver.The work of Courtney et al.