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.
Epidemic is a derivation of two Greek word epic (upon / among) and demos (people). It is the âunusualâ occurrence in a community or region of a disease specific health related events âclearly in excessâ of the âexpected occurrenceâ. Thus, any disease, which occurs in numbers more than the excepted occurrence, constitutes an epidemic. It includes heart diseases, or even psychosomatic disorders. Health affecting lifestyle like smoking, drug addiction and health related events like accidents also fall into the category of epidemics.