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The balls are filled with gas and to ensure that they all have the same "bounce" they are kept in a fridge until use. Gas expands by heat.

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14y ago

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Huh... -_-' I don't think so!

whos they?

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15y ago
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yes.. yes they are

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15y ago
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No. No they do not.

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Wiki User

13y ago
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Q: Do they keep tennis ball in a refrigerator?
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