实验
实验材料：塑料纸杯垫、小杯子、水。
![](https://wkrtcs.bdimg.com/rtcs/image?w=232.00&md5sum=78491310b5a12e69ba101e330815c723&sign=191f630fb3&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=288&ipr={"t":"img","r":"r_6","w":"232.00","h":"174.00","dataType":"jpeg","c":"word/media/image1.jpeg","imgOriW":532,"imgOriH":399})
实验过程：
（1）在杯中倒满水。
![](https://wkrtcs.bdimg.com/rtcs/image?w=234.00&md5sum=78491310b5a12e69ba101e330815c723&sign=191f630fb3&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=288&ipr={"t":"img","r":"r_8","w":"234.00","h":"175.00","dataType":"jpeg","c":"word/media/image2.jpeg","imgOriW":537,"imgOriH":401})
（2）将光滑的杯垫贴在装满水的杯口上
![](https://wkrtcs.bdimg.com/rtcs/image?w=234.00&md5sum=78491310b5a12e69ba101e330815c723&sign=191f630fb3&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=288&ipr={"t":"img","r":"r_8","w":"234.00","h":"176.00","dataType":"jpeg","c":"word/media/image3.jpeg","imgOriW":535,"imgOriH":403})
（3）用手压住杯垫，把杯子倒过来
![](https://wkrtcs.bdimg.com/rtcs/image?w=235.00&md5sum=78491310b5a12e69ba101e330815c723&sign=191f630fb3&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=288&ipr={"t":"img","r":"r_8","w":"235.00","h":"176.00","dataType":"jpeg","c":"word/media/image4.jpeg","imgOriW":538,"imgOriH":403})
报告
（4）将杯子放置于各种位置，杯垫不会掉下来
横放：
![](https://wkrtcs.bdimg.com/rtcs/image?w=231.00&md5sum=78491310b5a12e69ba101e330815c723&sign=191f630fb3&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=288&ipr={"t":"img","r":"r_8","w":"231.00","h":"173.00","dataType":"jpeg","c":"word/media/image5.jpeg","imgOriW":529,"imgOriH":397})
斜放
![](https://wkrtcs.bdimg.com/rtcs/image?w=236.00&md5sum=78491310b5a12e69ba101e330815c723&sign=191f630fb3&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=288&ipr={"t":"img","r":"r_8","w":"236.00","h":"177.00","dataType":"jpeg","c":"word/media/image6.jpeg","imgOriW":542,"imgOriH":406})
倒放：
![](https://wkrtcs.bdimg.com/rtcs/image?w=236.00&md5sum=78491310b5a12e69ba101e330815c723&sign=191f630fb3&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=288&ipr={"t":"img","r":"r_8","w":"236.00","h":"177.00","dataType":"jpeg","c":"word/media/image7.jpeg","imgOriW":542,"imgOriH":405})
实验结论：
杯垫不会掉下来，水也不会漏出是因为当杯子装满水时，杯子里几乎没有空气。杯外的大气压大于杯内水对杯垫的压强，大气压强将杯垫压在了水杯上。
本文来源：https://www.2haoxitong.net/k/doc/038958606e85ec3a87c24028915f804d2a168777.html
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