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.
In 1466, perhaps 40,000 people died of plague in Paris. [63] During the16th and 17th centuries, plague visited Paris for almost one year out ofthree. [64] The Black Death ravaged Europe for three years before itcontinued on into Russia, where the disease hit somewhere once everyfive or six years from 1350 to 1490. [65] Plague epidemics ravagedLondon in 1563, 1593, 1603, 1625, 1636, and 1665, [66] reducing itspopulation by 10 to 30% during those years.