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.
In general, an Intensity is a ratio. For example, pressure is the intensity of force as it is force/area. Also, density (symbol Ï) is the intensity of mass as it is mass/volume. The Intensity of waves (called Irradiance in Optics) is defined as the power delivered per unit area. The unit of Intensity will be W.m -2. The wave energy comes from the simple harmonic motion of its particles. The total energy will equal the maximum kinetic energy.