Why does almost every single glass go diagonally outwards/vertically instead of just being a fully vertical and straight sphere

Question

Why does almost every single glass go diagonally outwards/vertically instead of just being a fully vertical and straight sphere

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Answer 1

I have seen a lot of good answers already. It also comes down to manufacturing. A perfectly straight glass cylinder would cool and shrink onto the die that formed it. A tapered glass allows it to be removed from the machinery much easier.