A solid exerts pressure on a surface due to its weight.
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All liquids and gases are classified as fluids.
The concepts of net force in a particular direction (thrust) and force per unit area (pressure) help explain these phenomena, as they relate to how force is distributed over an area.
The effects of forces of the same magnitude are different on different areas because the pressure exerted by the force depends on the area over which it acts. Pressure is defined as thrust (force) per unit area. A larger area ...
When standing on loose sand, the thrust (or weight) is acting on a smaller area (the area of your feet), causing a greater impact on the sand. When lying down, the same thrust is distributed over a larger area (the ...