Bilge keels are passive stability systems. On commercial shipping the bilge keel is the form of a strake, or small keel or blister, running along much of the length of the hull. They are typically fitted one on each side, low down on the side of the hull, so as not to increase the draft of the vessel.
Intensity is a measure of the strength of shaking experienced in an earthquake. The Modified Mercalli Scale represents the local effect or damage caused by an earthquake; the intensity reported at different points generally decreases away from the earthquake epicenter.
m-mass of the particle of the medium a-amplitude of vibration and f-the frequency of vibration. So the intensity is the term used to mean the energy of sound waves. It is defined as the energy per unit area crossing in one second. 1 person found this useful.