Buoyancy. Buoyancy is the tendency of an object to float in a fluid, such as air or water. The principle of buoyancy was first discovered by Greek mathematician Archimedes (c. 287 â 212 b.c.) and is therefore often called Archimedes' Principle.therwise, it floats. The formal statement of Archimedes' Principle is this: the buoyant force acting on an object placed in a fluid is equal to the weight of the fluid displaced by the object. Suppose that the wood block in the example above has a volume of 1 cubic foot. A cubic foot of water weighs about 62.4 pounds.
Epidemic: The occurrence of more cases of a disease than would be expected in a community or region during a given time period.A sudden severe outbreak of a disease such as SARS. From the Greek epi-, upon + demos, people or population = epidemos = upon the population.. See also: Endemic; Pandemic.pidemic: The occurrence of more cases of a disease than would be expected in a community or region during a given time period.
A pandemic (from Greek Ïá¾¶Î½ (pan, âallâ) + + Î´á¿Î¼Î¿Ï (dÄmos, âthe peopleâ) is an epidemic that spreads across a large region (for example a continent), or even worldwide. Differences Between an Epidemic and a Pandemic. Simply put, when an epidemic gets out of hand, it is called a pandemic. This has 2 nuances: Geographical spread An epidemic that is not localized to a city or a small region but spans a larger geographical area can be called a pandemic. Incidence rate