impure air
21impur — impur, ure [ ɛ̃pyr ] adj. • XIVe; h. XIIIe lat. impurus ♦ Qui n est pas pur. 1 ♦ (XIVe) Altéré par un mélange; corrompu par des éléments étrangers. Eau impure, boueuse, bourbeuse. ⇒ pollué. Air impur. ⇒ vicié. 2 ♦ Dont la loi religieuse commande… …
22Zinc — This article is about the metallic element. For other uses, see Zinc (disambiguation). copper ← zinc → gallium ↑ Zn ↓ Cd …
23metallurgy — metallurgic, metallurgical, adj. metallurgically, adv. metallurgist /met l err jist/ or, esp. Brit., /meuh tal euhr jist/, n. /met l err jee/ or, esp. Brit., /meuh tal euhr jee/, n. 1. the technique or science of working or heating metals so as… …
24impureté — [ ɛ̃pyrte ] n. f. • fin XIVe; impurté v. 1380; lat. impuritas ♦ Caractère de ce qui est impur; chose impure. 1 ♦ Corruption résultant d une altération, d un mélange. ⇒ corruption, souillure. L impureté d un liquide, de l air. ⇒ pollution. ♢ Une,… …
25rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 …
26List of alchemical substances — Alchemical studies produced a number of substances, which were later classified as particular chemical compounds or mixtures of compounds.Many of these terms were in common use into the 20th century.* Aqua Fortis nitric acid, can be formed by 2… …
27NIDDAH — (Heb. נִדָּה menstruating woman ; literally, one who is excluded or expelled ). According to Jewish law, a man is forbidden to maintain sexual relations with his wife during and for some time both before and after (see below) her menses. Marital… …
28separation and purification — ▪ chemistry Introduction in chemistry, separation of a substance into its components and the removal of impurities. There are a large number of important applications in fields such as medicine and manufacturing. General principles… …
29Michael Wolff — This article is about the musician. For other uses, see Michael Wolff (disambiguation). Michael Wolff Michael Wolff, May 2011 Background information Birth name …
30Phosphorus — This article is about the chemical element. For other uses, see Phosphorus (disambiguation). silicon ← phosphorus → sulfur …
