雾是水组成的,那么为什么它不透明,而是白色的?为了解答这个问题,我们来到弗吉尼亚州布莱克斯堡。这里有条智能公路,专门用来在各种天气条件下测试汽车和交通系统。众所周知,光是由不同的波长组成的,而每一个波长的颜色都不同,当物体吸收某个波长,并反射其他波长时,我们就能看到不同的颜色。我们用激光照射人造雾。激光遇到雾的微小粒子后发生散射,这让我们能看见每一颗粒子。 The fog is made of water, so why is it opaque, but white? To answer this question, we come to Blacksburg, Virginia. There is a smart road specifically designed to test cars and transportation systems in a variety of weather conditions. It is well known that light is made up of different wavelengths and each color has a different color. When an object absorbs a certain wavelength and reflects other wavelengths, we can see different colors. We use laser to irradiate artificial fog. The laser collides with tiny particles of the fog and scatters, allowing us to see every single particle.