Continuity equations, such as those involving mass and energy, conserve physical events. The continuity equation states that A 1 = the cross-sectional area of region 1 and that A 2 = A 1 V 1.
The area of a 3D object's sliced cross section, like a pipe, is known as the cross sectional area. When a pipe is cut in half perpendicular to its longest axis, the cross sectional area of the top, circular component of the cut is determined.
A physical event is a change that can happen to a body, a matter, or a material that can either be reversible or not. A physical event must retain all of its original features or qualities in order to be considered physical.
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