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If the air is still there the mass stays the same. If the volume decreased: Denisty = mass/volume the Denisty of the ball has increased. I'd be more inclined to say as temperature decreases the air molecules move more slowly, hitting the sides of the ball less often, creating less pressure. But hey, I'm just an 8th grade science teacher.
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Why do you tell me the sky is the limit when there are footprints on the moon..... Unknown
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