Water molecule

From Glossary of Meteorology
Revision as of 18:14, 25 April 2012 by imported>Perlwikibot
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

water molecule

A molecule, consisting of one central oxygen atom and two hydrogen atoms along an angle of 104°, forming an electrostatic dipole because of the asymmetric distribution of charge.

The dipole results in a high dielectric constant for water, whether in vapor, liquid, or solid form. Resonances in the intermolecular bonds result in absorption and emission of electromagnetic radiation at near- and thermal-infrared wavelengths, hence the importance of water vapor in the greenhouse effect in the atmosphere and water substance as precipitation in the scattering and absorption of radar waves.