Pressure p lim Fnormal A→A A C-type Twisted tube Spiral Helical For a fluid with constant density in a uniform gravity field,P=Patm+pgh -density change with height/depth usually negligible unless large changes in height/depth -density change with temperature significantly -aravitational field change nealiaible unless vou ao outside our Water △Z P2 B PA=PB=PC=PD=PE=PF=PG=Patm+pgh Mercury PH≠PI H 上产天通大学 February 28,2019 19 SHANGHAI JIAO TONG UNIVERSITYFebruary 28, 2019 19 Pressure For a fluid with constant density in a uniform gravity field, P = Patm+ ρgh –density change with height/depth usually negligible unless large changes in height/depth –density change with temperature significantly –gravitational field change negligible unless you go outside our planet