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User Name Thread Name Subject Posted
jonm BS: Will wine age after it is bottled (23) RE: BS: Will wine age after it is bottled 08 Oct 10

Cork is used for stopping wine bottles because it has a Poisson's ratio of zero - in other words, if you apply force to the end to push it into the bottle, it does not become correspondingly fatter. All other materials, including the various types of synthetic cork, do become wider when force is applied lengthways. This means that once the stopper is in the bottle and the force is removed, the stopper will become slightly narrower in returning to its original shape. Synthetic corks are not as secure and more prone to air leakage, which is why real corks are still used for wines such as Beaunes which complete their ageing in the bottle.

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