Chemistry, study of the composition, structure, properties, and interactions of matter. Chemistry arose from attempts by people to transform metals into gold beginning about ad 100, an effort that became known as alchemy (see Chemistry, History of). Modern chemistry was established in the late 18th century, as scientists began identifying and verifying through scientific experimentation the elemental processes and interactions that create the gases, liquids, and solids that compose our physical world. As the field of chemistry developed in the 19th and 20th centuries, chemists learned how to create new substances that have many important applications in our lives

Heat Treatment of Metals

heat treatment

Heat Treatment Heating a metal or alloy to various definite temperatures, holding these for various time durations and cooling at various rates. Combination of controlled heating and cooling determine not only the nature and distribution of micro-constituents (which determine the…
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