Apart from solid-state plasmas, such as those in metallic crystals, plasmas do not usually occur naturally at the surface of the Earth. For laboratory experiments and technological applications, plasmas therefore must be produced artificially. So no a flame is not a plasma. Fun Fact: In advanced semiconductor production they are now using EUV light to expose wafers. They have to generate that light by producing a plasma from liquid tin and hitting it with a laser.
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