In physics and engineering, in particular fluid dynamics and hydrometry, the volumetric flow rate, (also known as volume flow rate, rate of fluid flow or volume velocity) is the volume of fluid which passes per unit time; usually represented by the symbol Q (sometimes VÌ). The SI unit is m3/s (cubic metres per second).
The symptoms of the disease were black and purple spots on the body. The spots soon began to become enlarged and swollen. The victims were taken captive by death in about two to seven days. The plague lasted for four years, but it still remained a recurrent fear until the seventeenth century.
Was there a cure for the Black Death? The disease last appeared in 1665 as The Great Plague. Symptoms changed over time as the microbes evolved and resistance in human beings increased. About a third of Europeâs population died (200 million people) when plague first struck in about 1347. Victims had no idea what the disease was or what had caused it. Most doctors in Medieval times did not know hardly anything about plague or how to cure it. The population decreased quickly.