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师:同学们,下面我们先做一个小游戏。伸直左臂,掌心向上,右手把文具盒放在左手上,放一会儿,你有什么感觉? 生:我觉得有一个力在压向左手。 师:这是一种什么力呢? 生:是物体的重量,也就是文具盒对手的压力。 师:对,任何事物都有重量,水也不例外,它也存在类似文具盒对手那样的压力,我们把它叫做“外部压力”。那么水的内部有没有压力呢?下面我们用一个实验来研究一下:在铁架台上固定一个“U”形管
Teacher: Classmates, let's start with a little game. Straighten his left arm, palm up, right hand to put the stationery on the left hand, put it for a while, what do you feel? Health: I think there is a force pressing the left hand. Teacher: What is this kind of power? Health: is the weight of the object, that is, the pressure on the stationery opponent. Teacher: Yes, everything has a weight, and water is no exception. It also has the same pressure as an opponent of a stationery box, which we call “external pressure.” Then there is no pressure inside the water? Here we use an experiment to study: fixed on the iron stand a “U” shaped tube