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Glass is made from intense bursts of heat on sand. The event happened within the last 30,000yrs ago. Ancient petrogrpahs of primirtive people (archeological carvings) from that era (12,000+y.a.) show the sun causing extreme energy bursts changing earth atmosphere. Oct 12, 2020 · The best way to think of an alloy is as a material that's made up of at least two different chemical elements, one of which is a metal. The most important metallic component of an alloy (often representing 90 percent or more of the material) is called the main metal , the parent metal , or the base metal . Mar 06, 2018 · The mole fraction of substance i in a mixture is defined as (2-1) in which n j is the number of moles of substance j, and the summation is over all substances in the solution. Mole fractions run from zero (substance not present) to unity (the pure substance). The sum of all mole fractions in a solution is, by definition, unity: (2-2) Problem ...