Saturday, 10 December 2011

Amazing Sponge

Sponge is a substance that absorbs water. There are many tiny holes on the sponge that help to absorb water. Besides the sponge, we can use other materials to absorb water.
海绵是一种能够吸水的材料。在海绵上有很多小孔洞,所以吸水能力很强。我们就用专门来吸水。除了海绵,我们在日常生活中也会用到其它一些会吸水的材料。

Some examples are/ 例如:

Exercise

Test Your Knowledge

Friday, 9 December 2011

Experiment 1


Indoor Rainbow

You need/你需要:


What to do/做法:
  1. Place the mirror inside the water-filled glass. Tilt the mirror slightly upward.把小镜子放进装有水的玻璃瓶内让镜子稍微向上倾斜一点。
  2. In a very dark room with white walls, shine the torch onto the mirror. 在一间有白色墙壁的黑暗房里用手电筒照向镜子。
  3. A rainbow appears.这时就会出现一道彩虹

Hint : If no rainbow appears, just change the angle of light from the torch or change the angle of the mirror.
提示:如果没有彩虹出现,只需要改变一下手电筒发出光线的角度,或者调整一下镜子的角度就可以了。

 
这是为什么呢?
手电筒的光线通过镜子反射出来,又在水中产生折射。(光线从一种物体射向另一种物体,传播方向一般会发生变化的现象)当光线折射以后,所有漂亮的颜色(红橙黄绿青蓝紫)就会出现,于是就会形成一道漂亮彩虹!