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取一只水杯让其盛满水，再取一硬纸片覆盖于杯上，使水杯和纸片倒置，水不会流出。此实验在初中物理中解释为由于硬纸片内侧受到水压小于硬纸片外侧之大气压（大气压可支持１０余米高的水柱），故而杯内之水不会流出。如果水杯口径为６cm，则其面积约为２８cm２，按大气压为每
Take a cup so that it fills with water, and then place a hard paper over the cup so that the cup and the paper are inverted and water does not flow out. This experiment was explained in junior high school physics because water pressure inside the cardboard is less than atmospheric pressure outside the cardboard (atmospheric pressure can support more than 10 meters high water column), so the water inside the cup does not flow out. If the diameter of the cup is 6cm, the area is about 28cm2, according to the atmospheric pressure