Tennis Ball Impact on Eye

A blow to the eye by a tennis ball can cause more damage than one might expect because of the transmission of the pressure to the back of the eye.

Ah! Pascal!

An air mattress takes advantage of Pascal's principle to protect you from the bumpy ground, rocks, and limbs. The pressure is equal on all the parts of your body which are in contact with the air matress. The same principle applies to a water bed since Pascal's principle applies to enclosed static fluids. The principle is used in clinical beds which reduce the incidence of ulcers on patients confined to bed for a lengthy period.

Hydraulic Brakes

The wheel cylinder of hydraulic drum brakes acts as a hydraulic press, multiplying the force on the fluid by the ratio of the area of the cylinder to the area of the supply line. Besides the muliplication of force achieved, Pascal's principle gaurantees that the pressure is transmitted equally to all parts of the enclosed fluid system. This gives straight-line braking unless there is a fluid leak or something to cause a significant difference in the friction of the surfaces.