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This question has been bugging me for about 20 years. And, ultimately, it still bugs me...

**Other YouTube videos about this**

This "It's OK to be Smart" is my favorite:    • What Is Fire?  

This Minute Physics one is SO SHORT and says SO MUCH!:    • What is fire?  

Veritasium has a video saying that fire is plasma (I don't think it is, but it does clearly contain lots of ions because, like, it's a bunch of intermediate reaction species that don't really have any set state of matter but are ionic):    • What's In A Candle Flame?  

And then this TedEd video gets into the "not matter, but a process" argument:    • Is fire a solid, a liquid, or a gas? ...  

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