Traditional Culture Encyclopedia - Weather forecast - When does air belong to colloid?

When does air belong to colloid?

The dust particles in the air are evenly mixed and the humidity is relatively high.

This phenomenon can often be seen in the Woods in the morning, and you can see the bright paths in the Woods (this is the Tindal effect), which proves that this is colloid.

If the above conditions are not met, it is not colloid.