Dunkirk: Where History Happened. We visit 10 places connected with the remarkable evacuation of the British Expeditionary Force from northern France in 1940. This feature was first published in the April 2010 edition of BBC History Magazine. Tuesday 25th May 2010.
The seepage velocity is less than the actual flow rate of the liquid or gas in the pores because the fluid moves only through the portion of the cross-sectional area S that is occupied by the pores.
Velocity is the rate at which an object changes its position. It is a vector quantity. The direction of velocity is the direction in which the object is moving. The absolute value or the magnitude of velocity is speed. Velocity can also be defined as the displacement of an object in a specified direction.If the object returns to its starting point then its velocity is zero.he direction of velocity is the direction in which the object is moving. The absolute value or the magnitude of velocity is speed. Velocity can also be defined as the displacement of an object in a specified direction.