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Answer
To seal a jar or flask, like a cork seals a bottle of wine.
They can be made out of either rubber or cork depending on the usage.
Also, a hole can be punched in it so that the jar is sealed except for a tube going through the rubber stopper.
See the Web Links to the left for pictures and more information about rubber and cork stoppers.
First answer by JEK. Last edit by JEK. Contributor trust: 1779 [recommend contributor]. Question popularity: 23 [recommend question]
Answers.com > Wiki Answers > Categories > Science > Chemistry > What is a rubber stopper or cork stopper and how are they used?
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