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[1] [2] The sudden application of a torch to the surface of stone causes the surface layer to expand and flake off, exposing rough stone. Flaming works well on granite, because granite is made up of minerals with differing heat expansion rates.
The air–fuel ratio is at the bottom region of the flammability range (i.e. lean). A rich flashover occurs when the flammable gases are ignited while at the upper region of the flammability range (i.e. rich). This can happen in rooms where the fire subsided because of lack of oxygen.
Fire-setting is a method of traditional mining used most commonly from prehistoric times up to the Middle Ages. Fires were set against a rock face to heat the stone , which was then doused with liquid, causing the stone to fracture by thermal shock .
In Koobi Fora, sites show evidence of control of fire by Homo erectus at 1.5 Mya with findings of reddened sediment that could come from heating at 200–400 °C (400–750 °F). [1] Evidence of possible human control of fire, found at Swartkrans , South Africa, [ 21 ] includes burned bones, including ones with hominin-inflicted cut marks ...
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Flint, occasionally flintstone, is a sedimentary cryptocrystalline form of the mineral quartz, [1] [2] categorized as the variety of chert that occurs in chalk or marly limestone. Historically, flint was widely used to make stone tools and start fires. Flint occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones.
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