Consider a fluid in a lake, which is set into disturbance from the origin by a mechanical source at time zero in the x-direction and at a speed of v-x. Let the speed of the mechanical wave be v. After a duration of t, the column of fluid that experiences the wave is contained within a distance v-t from the origin. If the fluid density and the cross-sectional area are known, the column's volume, its mass, and the momentum it has been imparted can also be determined. The column's original volume decreases, and this is used to derive the gauge pressure change via the bulk modulus. The impulse on the fluid column created by the disturbance is given by the gauge pressure change, the area, and the duration. The equation is then simplified. By using the impulse-momentum theorem, the speed of the disturbance in the medium can be obtained. It depends only on the fluid's bulk modulus and its density.