去南京珍珠泉玩的同学,常会把硬币轻轻放在泉水表面上,它会“飘”在水面而不沉下去.这里有两个问题要请你解释:(1)硬币是漂浮在水面上的吗?(2)是否只有珍珠泉的泉水才会有这种现象?第一个问题与物体沉浮条件有关,物体漂浮在水面的条件是浮力与重力平衡,也就是水的密度要大于物? When students go to Nanjing Zhuquan, they often place the coin on the surface of the spring. It will “fly” over the water without sinking. Here are two questions for you to explain: (1) The coin is floating on the water (2) Is it true that only the springs of the Pearl Spring have this phenomenon? The first problem is related to the conditions of the object’s floating and floating. The conditions for the objects to float on the water are the balance of buoyancy and gravity. That is, the density of water is greater than the material?