Why are standard drinking cups shaped the way the are, wider on the top and more narrow toward the bottom?

Question

Wouldn’t it make more sense to have the cup be a consistent width throughout? Or, even make the cup wider at the bottom to make it more stable when sitting on a surface?

In: Engineering

Answer 1

Cups are made that way so they are easy to release from the molds when they are manufactured. Also, it makes the cups stackable.