The ambulance vehicle, the armed police car, and the fire truck are all worked as emergency vehicles. However, they are in various color, why? Why the ambulance is white, the armed police car is black, but the fire truck is red?
The reason for the fire truck uses red is that sunlight is composed of seven colors: red, orange, yellow, green, cyan, blue, and purple, and their wavelengths and deflection angles are different. When sunlight shines on an object, various objects have different absorption and reflection abilities to the light of different wavelengths, therefore, various colors are formed. Among visible light, red light has the longest light wave and the smallest deflection angle, which makes it easy to pass through water, raindrops, dust, and fog. Therefore, the fire truck is painted red to allow people to see it from a far distance in foggy weather, dusty environment, or in heavy storms, and make way for it so that it can complete the firefighting and rescue mission as soon as possible.
There is another reason that red can inspire a fighting spirit and inspire people. Enhance people's fighting spirit for fire fighting and disaster relief.
However, in some western county, such as America, the color of their fire trucks is yellow-green, for Americans believe fire trucks in yellow-green can be more conspicuous in the dim light, especially in the rainy or foggy days.
