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  2. Fire glass - Wikipedia

    en.wikipedia.org/wiki/Fire_glass

    Fire glass (also fire pit glass, fire rocks, fire beads or lava glass) is a type of tempered glass, chunks of which are used decoratively on fireplaces. Pieces of the glass are heaped around jets of burning gas, or around liquid ethanol , in order to conceal the jets and reflect the flames. [ 1 ]

  3. Patio heater - Wikipedia

    en.wikipedia.org/wiki/Patio_heater

    Hanging patio heater: portable and small footprint; comes in electric only; Tabletop patio heater: ultra-portable and great for smaller groups or outdoor dining, but it uses a small propane tank; Patio heaters have become popular with bars and restaurants, since they extend the day and the season for their customers to sit outdoors.

  4. Fire brick - Wikipedia

    en.wikipedia.org/wiki/Fire_brick

    A fire brick, firebrick, fireclay brick, or refractory brick is a block of ceramic material used in lining furnaces, kilns, fireboxes, and fireplaces. A refractory brick is built primarily to withstand high temperature, but will also usually have a low thermal conductivity for greater energy efficiency .

  5. Fire making - Wikipedia

    en.wikipedia.org/wiki/Fire_making

    Fire making, fire lighting or fire craft is the process of artificially starting a fire. It requires completing the fire triangle , usually by heating tinder above its autoignition temperature . Fire is an essential tool for human survival and the use of fire was important in early human cultural history since the Lower Paleolithic .

  6. Fire piston - Wikipedia

    en.wikipedia.org/wiki/Fire_piston

    A 19th-century glass-cylinder fire syringe with a metal piston to which the tinder is attached Rapid compression of a gas increases its pressure and its temperature at the same time. If this compression is done too slowly the heat will dissipate to the surroundings as the gas returns to thermal equilibrium with them.

  7. Retroreflector - Wikipedia

    en.wikipedia.org/wiki/Retroreflector

    A set of three mutually perpendicular reflective surfaces, placed to form the internal corner of a cube, work as a retroreflector. The three corresponding normal vectors of the corner's sides form a basis (x, y, z) in which to represent the direction of an arbitrary incoming ray, [a, b, c].