How can you tell if there's chemistry between two people?

Anonymous
I'm a bit confused by the concept of chemistry. I flirt with some guys and I do have fun doing it. I sometimes end up with a fuzzy happy feeling; most probably because I see that they seemed attracted to me.

But I can't exactly tell if there's chemistry. So guys and gals, feel free to tell me all you know about it! What are signs there's chemistry between two people and your experiences, if any? Thanks! :)
How can you tell if there's chemistry between two people?
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