How to know when there's chemistry?

I know that when you have chemistry you just "feel it" but how would you describe it if you could? How can you tell when you have chemistry with someone?

It's also very easy to tell when two people have chemistry with each other, very often you see it in a guy and girl who are only friends.

What makes you think it's there or not based on signs, behavior, actions, body language, etc?
How to know when there's chemistry?
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