1 Buoyancy (also known as the buoyant force) is the force exerted on an object that is wholly or partly immersed in a fluid. 2  The symbol for the magnitude of buoyancy is B or FB.3  As a vector it must be stated with both magnitude and direction. Buoyancy (also known as the buoyant force) is the force exerted on an object that is wholly or partly immersed in a fluid. 2  The symbol for the magnitude of buoyancy is B or FB.
epicenter. 1  Also, epicentrum. Geology. a point, directly above the true center of disturbance, from which the shock waves of an earthquake apparently radiate. 2  a focal point, as of activity: Manhattan's Chinatown is the epicenter of the city's Chinese community.
Epicenter of an earthquake. Directly above the focus on the Earth's surface is the earthquake epicenter. Earthquake waves start at he focus and travel outward in all directions. Earthquake waves do not originate at the epicenter. News stories about earthquakes. Most news stories on earthquakes will list the epicenter of an earthquake and then tell how deep the earthquake was from the epicenter.