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These first Lazy-Man grills were marketed as "open-fire charcoal-type gas broilers" which featured "permanent coals", otherwise known as lava rock. [9] In the 1950s, most residential households did not have a barbecue, so the term broiler was used for marketing purposes to commercial establishments.
Scoria can be used for high-temperature insulation, as in gas barbecue grills. [9] The ancient Romans used cinders as construction aggregates, one of the earliest industrial uses of volcanic rocks. [7]
Charbroilers are energy intensive, and commonly use 15,000 to 30,000 BTU of gas per burner, per hour. Small units (four burners) will utilize 60,000 to 120,000 BTU/hr (approximately 0.6 – 1.2 therms of natural gas) and larger units up to 13 burners can use 195,000 to 390,000 BTU/hr (approximately 2 – 4 therms of natural gas).
The gas released at the surface has a composition that is a mass-flow average of the magma exsolved at various depths and is not representative of the magma conditions at any one depth. Molten rock (either magma or lava) near the atmosphere releases high-temperature volcanic gas (>400 °C).
The terms lava stone and lava rock are more used by marketers than geologists, who would likely say "volcanic rock" (because lava is a molten liquid and rock is solid). "Lava stone" may describe anything from a friable silicic pumice to solid mafic flow basalt, and is sometimes used to describe rocks that were never lava, but look as if they ...
Fire rock is manufactured lava rock that is sold in various shapes and sizes, and is used as a medium for retaining direct heat. Fire rocks are used in natural gas fireplaces or in natural gas or propane burning fire pits. It may be used as the main fuel distributor or as padding for fire glass to go on top.