Why does almost every single glass go diagonally outwards/vertically instead of just being a fully vertical and straight sphere
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Its easier to hold a flared glass or cup when it is wet with condensation. Ive asked myself this very question and noticed through the observation of using both types.
There is a practical reason for that design, you can stack glass with that design. This is an obvious advantage for storage if you carry multiple glasses. If you make a glass with a constant diameter that is not possible.
A conical glass is simpler to hold in your hand. If it was a constant diameter it is the friction between your hand and the glass that holds it still. If the glass is conical it needs to move your fingers out to slip down, so you only need to hold them in a circle so they do not move out to keep the glass from moving. So the friction between your hand and the glass is not relevant if it is conical
You can get glass with vertical walls if you look for them.
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.
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