A stock variable is measured at one specific time, and represents a quantity existing at that point in time (say, December 31, 2004), which may have accumulated in the past. A flow variable is measured over an interval of time. Therefore a flow would be measured per unit of time (say a year). Flow is roughly analogous to rate or speed in this sense
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A flow chart is a type of model, but not every model is a flow-chart.
flow proof is just run of text 2 colmn has line/column breaks
Current will flow if there is a difference of potential energy and a path between those points.
it is the difference between local flow direction and free stream direction of atmospheric air
True