One can get it through:
- Friction (examples: fire strikers, stick and hole, cotton with wood cole, )
- Compression (examples: fire piston, forged iron)
- Concentrating/focusing of sunlight in one point (examples: using lenses, mirrors )
- Chemical reactions (examples: permanganate and glycerine, oil on rigs and many others which produce enough heat to start a fire. some reactions might expand explosively, stay ready/protected)
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