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.
Exit velocity emerged in baseball almost by accident. Baseball evaluators became intrigued by the fact that radar guns used to measure how fast a pitch was moving toward the plate were also picking up the speed of the ball as it came off the bat.