Hydrogen
21hydrogen — The simplest element. Atomic number 1. Hydrogen gas has a specific gravity of 0.694 (air = 1), so it is much lighter than air. Hydrogen is highly flammable, forming water upon combustion. Explosive limit are 4% to 75% …
22hydrogen — A colorless, odorless, tasteless, slightly water soluble, highly flammable gaseous element, the lightest of all gases and the most abundant element in the universe. The hot flame produced by a mixture of oxygen and hydrogen is used in welding …
23hydrogen — [18] Greek húdōr ‘water’ (a distant relative of English water) has been a prolific source of English vocabulary. Amongst its contributions are hydrangea [18] (literally ‘water vessel’, so named from the cuplike shape of its seedpods), hydrant… …
24hydrogen — noun /ˈhaɪdɹədʒən/ a) The lightest chemical element (symbol H) with an atomic number of 1 and atomic weight of 1.00794. b) Molecular hydrogen (H), a colourless, odourless and flammable …
25hydrogen-2 — The isotope of h. of atomic wt. 2; the less common stable isotope of h., making up 0.015% of the h. atoms occurring in nature; the nucleus consists of a proton and a neutron. SYN: deuterium, heavy hydrogen …
26hydrogen-3 — A hydrogen isotope of atomic wt. 3; weakly radioactive, emitting beta particles to become the stable helium 3; half life, 12.32 years. SYN: tritium …
27Hydrogen- — Hy|d|ro|gen [↑ Hydrogen] Präfix für elektropositiven Wasserstoff in den Namen von Säuren u. sauren Salzen, z. B. Hydrogencarbonate, Hydrogensulfate, Hydrogenchlorid (↑ Chlorwasserstoff), Dihydrogenperoxid (↑ Wasserstoffperoxid), Dihydrogensulfid… …
28hydrogen — noun Hydrogen is used before these nouns: ↑bomb, ↑fuel, ↑gas, ↑molecule …
29Hydrogen... — ◆ Hy|dro|gen… 〈in Zus.; Chemie〉 aus einer Säure von Salzen entstanden, z. B. Hydrogen...carbonat [Etym.: <hydro… + …gen] ◆ Die Buchstabenfolge hy|dr… kann auch hyd|r… getrennt werden …
30hydrogen — [[t]ha͟ɪdrəʤ(ə)n[/t]] N UNCOUNT Hydrogen is a colourless gas that is the lightest and commonest element in the universe …
