Pressure – Force/Area

Pressure – Force/Area

• Pressure – Force/Area

• Units – pascal (Pa)

• Alternate Units – psi, in Hg, mb, atm, torr

• In fluids

• Molecular collisions giving a change in momentum.
• Direction is normal to the surface

• Pressure change perpendicular to equi-potential surface due to gravity.

Nonviscous - No internal friction

• Nonviscous - No internal friction

• Steady - Velocity at each point remains constant

• Incompressible - Density remains constant

• Irrotational - No angular momentum about a point within the fluid