Review: Fluids at rest What parameters do we use to describe fluids? Density Bulk modulus B △p (-△V/V) Pressure F=pAn A For incompressible fiuids(B>>p) p=const p(Ay )=Po+pgAy (y is depth) Pascals Principle Any change in the pressure applied to an enclosed fluid is transmitted to every portion of the fluid and to the walls of the containing vessel Physics 121: Lecture 21, Pg 2Physics 121: Lecture 21, Pg 2 Review: Fluids at Rest What parameters do we use to describe fluids? Density Bulk Modulus Pressure For incompressible fluids ( ) Pascal’s Principle: Any change in the pressure applied to an enclosed fluid is transmitted to every portion of the fluid and to the walls of the containing vessel. ( V /V) p B −  = B  p  = const. p(y ) = p0 +  gy (y is depth) F = pAn ˆ A n