瓶子里装满水用纸巾盖住瓶里的水

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索妍印湘阴县 ——[答案] 这是由于大气压的关系,用水装满瓶子后,在用纸盖住,倒置,由于外界大气压大于瓶内水柱大气压,所以水不掉下,纸也不掉下

赖强费15189453780:为什么一个瓶子灌满水用纸盖住到过来不会撒出?为什么一个瓶子灌满水
索妍印湘阴县 —— 原理:当瓶子装满水时,里边没有空气,瓶中也就是没有大气压力,只有水的压力,水的压力就和瓶子外面向上的大气压力平衡了(“抵消”了),所以纸板就“吸”在上边了.

赖强费15189453780:为什么装满水的水瓶用纸封住瓶口水不会落下,(因为大 -
索妍印湘阴县 —— 水是有流动性的 当你看到装满水的瓶子倒过来 水流出来是 也会看到一些气泡向上飘(瓶口越小越显著) 因为气体会随着液体流动所产生的空间进入 (上浮)这里大气压还是存在的!

赖强费15189453780:为什么把纸放在装满水的瓶子里水不会漏
索妍印湘阴县 —— 大气压问题,谁要从瓶子里漏出来需要外界气体冲入,水不会露出来是因为水和纸之间没有让气体进入的空隙,所以外界气压就会压住纸片,一旦有一丁点气体流入,水就会漏出来

赖强费15189453780:为什么装满水的水瓶用纸封住瓶口水不会落下,(因为大气压向上压住了那张纸)拿掉那张纸水却会落下? -
索妍印湘阴县 —— 是你说的前者.就是因为流动性.如果杯口很小,空气进不去,没有纸,水一样落不下来. 你想的很细.但还有东西忽略了.你说口小,只是进去的少是不对的.这牵扯到流体的粘滞性和表面张力.比如,同样的口(必须前提是足够小),油将比水更容易别空气＂堵住＂,就是粘滞性的差别.对于水,主要是表面张力限制了空气进去,不是进去少了,而是一点都进步去.空气要进去必须切断水表面,但是水表面有恢复本来形状的能力,所以口小后水下不来.(喝汽水如果过分仰头就不容易喝到,倾斜一定角度反而容易).而空气上浮本身是由于密度小于水,这个毋庸置疑.气泡上浮就是因为受到的浮力大于重力.本身有压强没错,但是浮力公式中已经考虑了所有压强带来的影响.是否明白了?

赖强费15189453780:把一个瓶子装满水,用张纸掩好,再倒过来,纸不会掉 这个原理是什么?
索妍印湘阴县 —— 用瓶子装满水,虽有一定重量,但是大气压强要比水的压强大得多,就会托住纸,是水不会倒出来

赖强费15189453780:在喝水的玻璃瓶内倒入满满的水,用纸盖住瓶口,把玻璃瓶反过来,纸不会掉也不会漏水,为什么? -
索妍印湘阴县 —— 是因为大气压强的原因

赖强费15189453780:在瓶子里装满水,再在瓶口盖上一张塑料纸,水为什么不向低处流
索妍印湘阴县 —— 应为瓶子是竖着放的

赖强费15189453780:(1)如图甲所示在瓶内灌满水,用一张纸片盖住瓶口,压紧后倒置,由于___的作用,水和纸片都不会下落.(2)如图乙所示,将纸条的一端按在嘴唇的下方,... -
索妍印湘阴县 ——[答案] (1)把装满水的玻璃杯盖上硬纸片倒置过来,水和纸片都不会下落,这是由于大气压将纸片托住了,此实验的目的是为了验证大气压的存在.(2)将纸条的一端按在嘴唇的下方,向前吹气,因为纸条上方的空气流速大,压强小...

赖强费15189453780:装满水的瓶子,用纸片盖住,倒过来,纸片和水都不会掉(大气压)为什么抽掉纸片水就会掉下来?大气压去哪了? -
索妍印湘阴县 —— 首先,在理想情况下,水是可以不掉下来的,但由于水是流体,空气在对其表面发生作用时不能保证各处受力均匀,导致水的流动性,一旦水的流动性产生,就会造成表面积的扩大和不规则形状的出现,加之重力作用,使水的表面受力更加混乱,最终导致水的流下.而纸张的作用正是凭借其固体性质保证时刻水的表面不会因受力不均导致变化,也就不会流下了请及时采纳,谢谢 来自百度http://wenwen.sogou.com/z/q846474132.htm点击查看