system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do some clear liquids turn foggy when mixed together?

Working at a bar, have always wondered why clear (pilsner) beer and clear apple cider turn foggy when mixed together. I'm sure there are plenty other examples. How is this, and why are substances clear or foggy in the first place?
gpt
There are two ways this very often occurs: either it forms millions of tiny bubbles (like with your drinks, because they form or release a gas) or it forms millions of tiny solid particles (called precipitate) because of their chemistry. There are other ways that this happens, but these two ways are the most common.

Substances are clear because of the arrangement of the electrons in the chemicals. The chemicals that interfere very little get part of the light spectrum absorbed when light passes through, so it looks colored. If the chemicals interfere basically not at all (like water) it looks clear.

Things get distorted through liquid for the same reason lens do: they change light's direction.