Fluid Statics

• Concerned with forces in a stationary fluid
• Recall. In a stationary fluid, shear stress . However, fluid can sustain the normal stress.

• Fluid pressure: It is a normal force per unit area of the fluid element, acting inward onto the element. Consider a fluid element, ABC:

Pressure acts inward on all three faces of the element.

Consider another fluid element:

Pressure also acts inward on the differential element dA