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When we press a rubber sucker against a smooth wall ,

_________________between the sucker and the wall is forced out.________________is lower than that outside .The great atmospheric pressure outside______________.

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  • 天同
    Lv 7
    8 years ago
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    When we press a rubber sucker against a smooth wall , air between the sucker and the wall is forced out._The air pressure inside_is lower than that outside .The great atmospheric pressure outside holds the sucker in place.

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