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These amounts can be scaled up or down to suit the desired capacity or operation of a particular chemical plant built for such a process. More than one chemical plant may use the same chemical process, each plant perhaps at differently scaled capacities. Chemical processes like distillation and crystallization go back to alchemy in Alexandria ...
Kitchen utensils in bronze discovered in Pompeii. Illustration by Hercule Catenacci in 1864. Benjamin Thompson noted at the start of the 19th century that kitchen utensils were commonly made of copper, with various efforts made to prevent the copper from reacting with food (particularly its acidic contents) at the temperatures used for cooking, including tinning, enamelling, and varnishing.
While financial economists use the word investment to refer to the acquisition and holding of potentially income-generating forms of wealth such as stocks and bonds, [9] macroeconomists usually use the word for the sum of fixed investment—the purchasing of a certain amount of newly produced productive equipment, buildings or other productive ...
Belt grinder, which is usually used as a machining method to process metals and other materials, with the aid of coated abrasives. Analogous to a belt sander (which itself is often used for wood but sometimes metal). Belt grinding is a versatile process suitable for all kind of applications, including finishing, deburring, and stock removal.
Countertop blenders use a 1–2 liters (4–8 cups) blending container made of glass, plastic, stainless steel. [1] Glass blenders are heavier and more stable. [1] Plastic is prone to scratching and absorbing the smell of blended food. [1] Stainless steel is preferred for its appearance, but limits visibility of the food as it is blended. [1]
Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...
Certain chemical process yield important basic materials for society, e.g., (cement, steel, aluminum, and fertilizer).However, these chemical reactions contribute to climate change by emitting carbon dioxide, a greenhouse gas, through chemical reactions, as well as through the combustion of fossil fuels to generate the high temperatures needed to reach the activation energies of the chemical ...
The English word machine comes through Middle French from Latin machina, [2] which in turn derives from the Greek (Doric μαχανά makhana, Ionic μηχανή mekhane 'contrivance, machine, engine', [3] a derivation from μῆχος mekhos 'means, expedient, remedy' [4]). [5] The word mechanical (Greek: μηχανικός) comes from the ...