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五、压强 1、找一只小方凳,用杆秤称出它的重量,用刻度尺量出凳脚和凳面的面积。比较一下,正放和倒放时它们对地面的压强各为多少? 2、自制简易压强计:找一个空油脂盒,取下盒盖,蒙上一块橡皮膜(从破碎的气球上剪下一块),在底部开一个小孔,焊上一小段管子(可利用盒盖的薄铁皮)。另取一小块木板或厚纸板,用细铅丝固定一根弯成U形的透明塑料管,内灌少许有色液体,一端将它和盒底的管子连接起来,就做成了一个简易压强计(如图)。思考一下:为了测量微小压强,其中的液体选用水、盐水、煤油,哪
Fifth, the pressure 1, find a small square stool, weigh it with a rod scale, measure the area of stool feet and stool surface with a scale. Compare, when they are put on and put back the pressure on the ground for how much? 2, made simple pressure gauge: find an empty grease box, remove the lid, covered with a rubber membrane (cut from a broken balloon ), A small hole in the bottom, welding a short tube (available lid lid of thin metal). Another take a small piece of wood or cardboard, with a thin lead wire fixed into a U-shaped transparent plastic tube, filling a little colored liquid, one end of the tube and the bottom of the box to connect it to make a simple pressure gauge (Pictured). Think about it: In order to measure the slight pressure, one of the liquids used is water, salt water and kerosene, which