盐粒还会“跳舞”?怎么个“跳”法呢?别急,且让我们细细看..实验材料:杯子一个、塑料薄膜一块、食盐少许、棉线一段.操作步骤:1.将塑料薄膜蒙在干燥的杯子上,绷紧后用棉线系好.2.往塑料薄膜上撒一些食盐(如图1).3.在放有食盐的塑料薄膜旁边大喊一声(不要正对着塑料薄膜,以防气流把盐粒吹走),观察实验现象.我们在放有食盐的塑料薄膜旁边大喊一声,能很明显地观察到盐粒在“跳舞”.声音越大,盐粒“跳”得越高.盐粒为什么会“跳舞”呢?声音是由物体的振动产生的,并以波的形式传播.声波可以传递能量.当我们在放有 Salt particles will How do a “jump ” method? Do not worry, and let us look carefully .. Experimental materials: a cup, a piece of plastic film, a little salt, 1. Put the plastic film in a dry cup and tighten it with cotton thread 2. Sprinkle some plastic salt on the plastic film (Picture 1) 3. Shout next to the plastic film with salt (Do not Facing the plastic film to prevent the flow of salt particles blown away), observe the experimental phenomenon.We shouted beside the salt plastic film can be clearly observed salt particles in the Salt and salt are the causes of the “dancing” sound? Sound is generated by the vibration of the object, and spread in the form of waves. Sound waves can transfer energy when we put