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.
9 PLACES CONNECTED TO THE BLACK DEATH. Medieval observers â and their modern counterparts in 19th-century China and 20th-century Vietnam, observing more recent outbreaks â noted that different strains of the disease took from five days to as little as half a day to cause death.