[puh-tas-ee-uh m-ahr-gon] /pəˈtæs i əmˌɑr gɒn/
a method for estimating the age of a mineral or rock, based on measurement of the rate of decay of radioactive potassium into argon.
a technique for determining the age of minerals based on the occurrence in natural potassium of a small fixed amount of radioisotope 40K that decays to the stable argon isotope 40Ar with a half-life of 1.28 × 109 years. Measurement of the ratio of these isotopes thus gives the age of the mineral Compare radiocarbon dating, rubidium-strontium dating
A method of radiometric dating, involving analysis of the ratio of potassium 40 (a radioactive isotope of potassium) to argon (the product of radioactive decay of potassium 40) in a given sample.
noun, Chemistry, Pharmacology. 1. a white, crystalline, slightly alkaline, salty-tasting, water-soluble powder, KHCO 3 , produced by the passage of carbon dioxide through an aqueous potassium carbonate solution: used in cookery as a leavening agent and in medicine as an antacid. potassium bicarbonate n. A compound in the form of a white powder or colorless […]
noun, Chemistry. 1. . noun, Chemistry. 1. an orange-red, crystalline, water-soluble, poisonous powder, K 2 Cr 2 O 7 , used chiefly in dyeing, photography, and as a laboratory reagent. noun 1. an orange-red crystalline soluble solid substance that is a good oxidizing agent and is used in making chrome pigments and as a bleaching […]
noun, Chemistry. 1. a white, crystalline, hygroscopic, poisonous solid, KHC 2 O 4 , that is usually hydrated: used chiefly for removing ink stains, cleaning metal and wood, and in photography.
noun, Chemistry. 1. a colorless, crystalline, water-soluble solid, KHSO 4 , used chiefly in the conversion of tartrates to bitartrates.