Traditional Culture Encyclopedia - Weather inquiry - The illusion of water in front of expressway on a sunny day. What happened?

The illusion of water in front of expressway on a sunny day. What happened?

This is because the road surface is very hot, the air temperature is high, the expansion and density are low, and light is refracted through uneven air.

Light is refracted through the ground air and shines into the eyes. It looks like it reflects the distant light, so it feels like there is water, but it is not!