system
Given the following post, respond as if you're commenting on Reddit:
human
[ELI5] Why do you see water on the road when it's hot outside?

Why do you see water on the road when it's hot outside even though there's not actually water there? And also related, why does it look wavy near the ground when its really hot outside? ELI5 please.
gpt
You know the way light reflects off a mirror or off the water?  Well, light also reflects off of air - *if* there's a layer of air that's much hotter than the layer of air below it.

You know how when you look at the air above a stove and it's all wiggly?  That's the air making the light bounce funny because of the change in temperature.  When you look at the road, it makes the air all funny, too.  The cool thing is that if you look at it low enough - or if the road is far enough away - the light bounces so funny that it never hits the road at all - it shoots right back up into the sky!  

When it looks like water on the road, that's just the sky reflecting on the hot, bouncy air, just the same as it would on running water.