hydrogen


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hydrogen

 (H) [hi´dro-jen]
a chemical element, atomic number 1, atomic weight 1.00797. (See Appendix 6.) It exists as the mass 1 isotope (protium, or light or ordinary hydrogen), mass 2 isotope (deuterium, heavy hydrogen), and mass 3 isotope (tritium).
hydrogen cyanide an extremely poisonous colorless liquid or gas, HCN, a decomposition product of various naturally occurring glycosides and a common cause of cyanide poisoning. Inhalation of the gas can cause death within a minute. Called also hydrocyanic acid.
heavy hydrogen deuterium.
hydrogen ion concentration the degree of concentration of hydrogen ions (the acid element) in a solution. Its symbol is pH, and it expresses the degree to which a solution is acidic or alkaline. The pH range extends from 0 to 14, pH 7 being neutral, a pH of less than 7 indicating acidity, and one above 7 indicating alkalinity. See also acid-base balance.
hydrogen peroxide H2O2, an antiseptic with a mildly antibacterial action. A 3 per cent solution foams on touching skin or mucous membrane and appears to have a mechanical cleansing action.
hydrogen sulfide H2S, a poisonous gas with an offensive smell, released from decaying organic material, natural gas, petroleum, and sulfur deposits, and sometimes used as a chemical reagent.

hy·dro·gen (H),

(hī'drō-jen),
1. A gaseous element, atomic no. 1, atomic wt. 1.00794.
2. The molecular form (H2) of the element. Synonym(s): dihydrogen
[hydro- + G. -gen, producing]

hy·dro·gen

(H) (hī'drō-jen)
1. A gaseous element, atomic no. 1, atomic wt. 1.00794.
2. The molecular form of the element, H2.
Synonym(s): dihydrogen.
[hydro- + G. -gen, producing]

Hydrogen

The simplest, most common element known in the universe. It is composed of a single electron (negatively charged particle) circling a nucleus consisting of a single proton (positively charged particle). It is the nuclear proton of hydrogen that makes MRI possible by reacting resonantly to radio waves while aligned in a magnetic field.

hy·dro·gen

(hī'drō-jen)
1. Gaseous element, atomic no. 1, atomic wt. 1.00794.
2. Molecular form (H2) of the element.
[hydro- + G. -gen, producing]
References in periodicals archive ?
BOCs project is a great example of leveraging current industrial gas equipment and infrastructure, and will also trial renewable hydrogen in refuelling.
Launched at the World Economic Forum in Davos in 2017, the Hydrogen Council is a first-of-its-kind global CEO initiative to foster the role of hydrogen technologies in the global energy transition.
Hydrogen, Zhai said, can be used directly as fuel in power generation and other heat applications.
The network will also include hydrogen distribution control centres.
"Toyota has long maintained that hydrogen fuel cell technology could be a zero-emission solution across a broad spectrum of vehicle types," said Russ Koble, a spokesman in Toyota's environmental and advanced technology group.
"Unlike carbon, which creates greenhouse gas and fine dust, hydrogen is a clean energy that produces only water as a by-product.
In recent years, CFD method has become a choice to analyze the hydrogen risk [4].
The company added that the commercially available low-cost silicon solar cells were supplied by Midwest Optoelectronics LLC, representing yet another indication of the potential of HyperSolar's technology for economically viable production of hydrogen.
"We have this great opportunity to basically convert the hydrocarbon industry into a hydrogen economy," he said.
- Work to increase hydrogen fuel cell taxies to 80,000 by 2040
Since fuel cells carry compressed Hydrogen, there can be a risk of explosion.
She read up on how hydrogen water contains hydrogen molecules that act as powerful antioxidants to neutralize free radicals.