Eli5 how come glass bottles have seams aren’t they made in one peice?

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Eli5 how come glass bottles have seams aren’t they made in one peice?

In: Technology
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I think the seams make the glass more turgid/stronger. Without them, the glass would simply shatter.

Usually the seams are an artifact of the mold. The mold is two pieces of metal that you put together to form a 3D shape like a bottle. When you pull the mold off the glass, the seams are left where the metal comes together.