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...]], that appears to be surrounded by a much larger region of cold, neutral hydrogen.

...lled with a gas less dense than air or lighter than air (such as helium or hydrogen).

...sting of two or more molecules held together by van der Waals forces or by hydrogen bonds.

A molecule containing only carbon and hydrogen that exhibits unusual stability and reactivity from having a cyclic conjuga

{{r|Hydrogen-like atom}} {{r|Hydrogen}}

...ompound that contains the functional group composed of a sulfur atom and a hydrogen atom (-SH).

...usually slightly cooler than our Sun and often orange in colour; includes hydrogen-burning 'main sequence' stars and older, giant stars such as Arcturus.

Biochemical with an amino group, a carboxyl group, a hydrogen atom, and a side chain bonded to a central carbon.

..._heating_values.xls Lower and Higher Heating Values of Hydrogen and Fuels] Hydrogen Analysis Resource Center, [[U.S. Department of Energy]]

{{r|Hydrogen bond}} {{r|Hydrogen-like atom}}

...iginally developed for killing insects and rats, a stable preparation of [[hydrogen cyanide]] that, with modifications, was the chemical used in the [[Auschwit

A molecule consisting of an oxygen atom and a hydrogen atom connected by a covalent bond (single bond).

...a [[rocket engine]] but sometimes in a [[turbine]], such as concentrated [[hydrogen peroxide]] passed over a catalyst that breaks it into steam

A [[chemical compound]] with the [[chemical formula|formula]] [[Hydrogen|H]]₂[[Sulphur|S]], which is a colorless, highly toxic, flammabl

<includeonly> </includeonly><noinclude>Hydrogen is in a class of its own, as in some instances it can behave like a metal a

'''Zyklon B''' was a stabilized preparation of [[hydrogen cyanide]], originally developed for killing insects and rats, but, with mo The basic preparation, for commercial use, had the hydrogen cyanide adsorbed onto an inert substrate, along with a warning agent that w

A haematological condition in which the reducing hydrogen ion concentration of arterial blood plasma (alkalemia), results in the pH o

...here most stars - all those in the phase where they shine from energy from Hydrogen fusion in there core, is called the "[[main sequence]]".]] ...gh [[Hydrogen fusion]] - the nuclear process where the nuclei of several [[Hydrogen]] atoms fuse to form an atom of [[Helium]]. Every star above the main sequ

...mistry]] &mdash; from the [[chemical element|elements]] [[nitrogen]] and [[hydrogen]].

A chemical compound with one oxygen and two hydrogen atoms (H₂0). It is often in a liquid form and makes up the bulk