做大气压实验英语作文80词
2020-07-26 09:18:01
A glass cup with a hard paper to Gaiyan hand and hold the paper cup upside down, let go after, cardboard whereabouts immediately. When filled with water in the cup after cup with a hard paper to Gaiyan hand and hold the paper cup upside down, and then release the hand, the paper does not fall, the water does not flow out, which indicates that there is pressure atmosphere. It is because of the role of atmospheric pressure, the paper does not fall
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