so it is the pressure that when acting uniformly over a flat surface of area 1 (metre) squared causes a total force of magnitude 1 newton to act in a direction perpendicular to that surface. [P7.2]
is defined: by so it is the pressure that when acting uniformly over a flat surface of area 1 (metre) squared causes a total force of magnitude 1 newton to act in a direction perpendicular to that surface. [P7.2]
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