Why do plastic bottles have a dent?
Why do plastic bottles have a dent? The dent acts as a speck where you can place your thumb or palm and use the other fingers to wrap around the base which makes it easier to hold the bottle. Why are water bottles not flat on the bottom? Water bottles have small indents to improve the stability of the bottle. The bumps or the corrugations in the foot of the bottle increases the strength of the bottle. Take a sheet of paper and fold it. When a liquid is cooled, its volume changes and the bottle must not buckle because...