The flow condition of a fluid system when one of the fundamental nondimensional parameters has a critical value, for example, flow of water in an open channel at a Froude number of 1, flow of gas at a Mach number of 1, flow in a pipe at Reynolds number greater than 2100, or shear flow in the atmosphere at Richardson number less than 0.25.
Where did the Vikings come from? The Vikings came from the countries which we know now as Denmark, Norway and Sweden. We refer to the area that these countries are located as Scandinavia. The Vikings lived mainly along the coastlines of these countries or along the rivers which ran into the seas.These are the Vikings that left their lands to explore, invade and settle in other lands, Some Vikings did live further inland but, like most settlements and villages, they were often located near to rivers.he Vikings lived mainly along the coastlines of these countries or along the rivers which ran into the seas. These are the Vikings that left their lands to explore, invade and settle in other lands, Some Vikings did live further inland but, like most settlements and villages, they were often located near to rivers.
The Vikings were the people who came from Scandinavia (Denmark, Norway, and Sweden) from about AD 700 to about 1125. This period is called the Viking Age. Vikings traveled great distances in their longships, as traders, settlers and warriors. Many of the Vikings were tall and had red or blonde hair and beards.