Pressure acts in a fluid in all directions. It increases with depth due to the increased weight of fluid, and results in an upthrust. Objects sink or float depending on whether the weight of the object is bigger or smaller than the upthrust. Different stresses on a solid object can be used to explain observations where objects scratch, sink into or break surfaces.
You can use the pressure equation to make predictions about pressure and also rearrange it to find force or area if you are given the other 2 variables
Pressure = Force / Area
Force = Pressure X Area
Area = Force / Pressure
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