force, A push or pull on an object, which has both magnitude and direction, pressure, The force applied perpendicular to the surface of an object per unit area over which that force is distributed, area, The amount of space occupied by a two-dimensional (flat) surface, newton, The basic unit of force, square metre, The basic unit of area, Pressure, p = F / A, units for pressure, atmosphere (atm), bar, mmHg, torr, PSI, manometers and barometers, Measuring gauges for pressure in gases and liquids

Ground pressure

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