Bottomless Bottle

Pressure is transmitted undiminished in an enclosed static fluid.

Bottle magic by Deena Hoch

Any externally applied pressure is transmitted to all parts of the enclosed fluid, making possible a large multiplication of force (hydraulic press principle). One particularly useless but nonetheless interesting application of Pascal's principle is the dropping of the bottom out of a glass bottle. If the bottle is filled to the top with water, then any pressure exerted on the water is transmitted undiminished to the bottom of the bottle, which has a larger area. The multiplied force can pop the bottom out of the bottle.