neutral hydrogen

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• Hydrogen line — For hydrogen lines in general, see Hydrogen spectral series. The hydrogen line, 21 centimeter line or HI line refers to the electromagnetic radiation spectral line that is created by a change in the energy state of neutral hydrogen atoms. This… …   Wikipedia

• Hydrogen — This article is about the chemistry of hydrogen. For the physics of atomic hydrogen, see Hydrogen atom. For other meanings, see Hydrogen (disambiguation). ← hydrogen → helium …   Wikipedia

• hydrogen cloud — ▪ astronomy also spelled  H I region  or  H i region        in astronomy, interstellar matter composed of neutral hydrogen atoms. Most of the matter between the stars in the Milky Way Galaxy, to which the Earth belongs, as well as in other spiral …   Universalium

• Hydrogen cyanide — IUPAC name …   Wikipedia

• Hydrogen technologies — are technologies that relate to the production and use of hydrogen. Hydrogen technologies are applicable for many uses.Some hydrogen technologies are carbon neutral and could have a role in preventing climate change and a possible future hydrogen …   Wikipedia

• Neutral — Neu tral, a. [L. neutralis, fr. neuter. See {Neuter}.] 1. Not engaged on either side; not taking part with or assisting either of two or more contending parties; neuter; indifferent. [1913 Webster] The heart can not possibly remain neutral, but… …   The Collaborative International Dictionary of English

• Neutral axis — Neutral Neu tral, a. [L. neutralis, fr. neuter. See {Neuter}.] 1. Not engaged on either side; not taking part with or assisting either of two or more contending parties; neuter; indifferent. [1913 Webster] The heart can not possibly remain… …   The Collaborative International Dictionary of English

• Neutral equilibrium — Neutral Neu tral, a. [L. neutralis, fr. neuter. See {Neuter}.] 1. Not engaged on either side; not taking part with or assisting either of two or more contending parties; neuter; indifferent. [1913 Webster] The heart can not possibly remain… …   The Collaborative International Dictionary of English

• Neutral salt — Neutral Neu tral, a. [L. neutralis, fr. neuter. See {Neuter}.] 1. Not engaged on either side; not taking part with or assisting either of two or more contending parties; neuter; indifferent. [1913 Webster] The heart can not possibly remain… …   The Collaborative International Dictionary of English

• Neutral surface — Neutral Neu tral, a. [L. neutralis, fr. neuter. See {Neuter}.] 1. Not engaged on either side; not taking part with or assisting either of two or more contending parties; neuter; indifferent. [1913 Webster] The heart can not possibly remain… …   The Collaborative International Dictionary of English

• Neutral tint — Neutral Neu tral, a. [L. neutralis, fr. neuter. See {Neuter}.] 1. Not engaged on either side; not taking part with or assisting either of two or more contending parties; neuter; indifferent. [1913 Webster] The heart can not possibly remain… …   The Collaborative International Dictionary of English