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实验材料:三枚大头针、一枚硬币、一块小木板。实验步骤:1.把三枚大头针插在木板中央,使之排成三角形。2.把木板放到桌子上,让木板的边缘与桌边对齐。3.把硬币放在三枚大头针上。4.对着硬币吹气。分别从硬币的侧面和下面吹。试试看,从哪一面吹气可以把硬币从这三枚大头针上吹起来。实验揭秘:当气流吹向硬币的侧面时,它只能从硬币下面的缝隙中通过,因此,减弱了硬币下面的气压。同时,硬币上面的正常大气压却更结实
Experimental Materials: Three Pins, One Coin, One Small Wooden Board. Experimental steps: 1. The three pins inserted in the center of the board, so arranged in a triangle. 2. Put the board on the table and align the edge of the board with the table. Put the coin on three pins. Blow into the coin. Blow from the side and bottom of the coin separately. Try it, blowing from the side where you can blow up the coins from the three pins. Experimental Secret: As the air blows toward the side of the coin it can only pass through the gap under the coin, thus weakening the pressure under the coin. At the same time, the normal atmospheric pressure above the coin is stronger