Volatiles


Volatiles

In planetary science, volatiles, are that group of elements and compounds with low boiling points (see volatile) that are associated with a planet's or moon's crust and/or atmosphere. Examples include nitrogen, water, carbon dioxide, ammonia, hydrogen and methane, all compounds of C, H, O and/or N, as well as sulfur dioxide. In astrogeology, these compounds, in their solid state, often comprise large proportions of the crusts of moons and dwarf planets. In terrestrial geology, the term more specifically refers to components of magma (mostly water vapor and carbon dioxide) that affect the appearance and strength of volcanoes. Volatiles affect the viscosity of the magma, and the tendency to explosive eruptions.

Planetary scientists often class volatiles with exceptionally low melting points, such as hydrogen and helium, as gases (as in gas giant), while those volatiles with melting points above about 100 K are referred to as ices. The terms "gas" and "ice" in this context can apply to compounds that may be solids, liquids or gases. Thus, Jupiter and Saturn are referred to as "gas giants" even though the vast majority of the "gas" in their interiors is liquid, and Uranus and Neptune are called "ice giants" despite the fact that neither planet contains more than trace amounts of solid ice.

The Earth's Moon is considered very low in volatiles: its crust contains oxygen chemically bound into the rocks (as eg silicates), but negligible amounts of hydrogen, nitrogen or carbon.

In contrast, those elements with high boiling points are known as "refractory elements". [cite web | url= http://www.psrd.hawaii.edu/PSRDglossary.html#refractory | title=Glossary | work=Planetary Science Research Discoveries | date=Updated January 2008 | accessdate=2008-08-28]

References

External links

* [http://yesserver.space.swri.edu/yes2000/glossary.html Glossary] of planetary astronomy terms
* [http://sio.ucsd.edu/volcano/about/volatiles.html Volatiles] of Costa Rican volcanoes.
* [http://www.psrd.hawaii.edu/PSRDglossary.html#volatile Volatile] Planetary Science Research Discoveries


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • volatiles — noun a) The volatile part of a petroleum fraction b) The volatile parts of a planets atmosphere or crust …   Wiktionary

  • volatiles —    Substances with relatively large vapor pressures. Many organic substances are almost insoluble in water so that they occur primarily in a gas phase in contact with water, even though their vapor pressure may be very small [22] …   Lexicon of Cave and Karst Terminology

  • volatiles — vol·a·tile || vÉ‘lÉ™tl / vÉ’lÉ™taɪl n. liquid that quickly vaporizes at relatively low temperatures (i.e. gasoline, paint thinner, etc.) adj. evaporating easily; rapidly changing; fickle …   English contemporary dictionary

  • Volatiles Anästhetikum — Inhalationsanästhetika (auch Inhalationsnarkotika) sind Arzneistoffe, die in der Anästhesie zur Aufrechterhaltung und ferner auch zur Einleitung der Narkose eingesetzt werden und durch Inhalation aufgenommen werden. Inhalationsanästhetika werden… …   Deutsch Wikipedia

  • Compuestos orgánicos volátiles — Los compuestos orgánicos son sustancias químicas que contienen carbono y se encuentran en todos los elementos vivos. Los compuestos orgánicos volátiles, a veces llamados VOC (por sus siglas en inglés), o COV (por sus siglas en español), se… …   Wikipedia Español

  • Matières Volatiles Sèches — Matière sèche Pour les articles homonymes, voir MS. La matière sèche (MS) est ce que l on obtient lorsqu on retire l eau d un produit. Le pourcentage de matière sèche est le ratio entre le poids de la matière sèche et la masse de la matière non… …   Wikipédia en Français

  • Taux de Matières Volatiles Sèches — Matière sèche Pour les articles homonymes, voir MS. La matière sèche (MS) est ce que l on obtient lorsqu on retire l eau d un produit. Le pourcentage de matière sèche est le ratio entre le poids de la matière sèche et la masse de la matière non… …   Wikipédia en Français

  • Estimate of excess volatiles — ▪ Table Estimate of excess volatiles (units of 1020 grams) water 16,600 total carbon as carbon dioxide 910 sulfur 22 nitrogen 42 chlorine 300 hydrogen 10 boron, bromine, argon, fluorine, etc. 4 Source: W.W. Rubey (1951). See as table: * * * …   Universalium

  • Estimate of excess volatiles 1 — ▪ Table Estimate of excess volatiles (units of 1020 grams) water 16,660 total carbon as carbon dioxide 2,500 chlorine 300 nitrogen 49 sulfur 44 boron, bromine, argon, fluorine, etc. 4 Source: J.C.G. Walker, Evolution of the Atmosphere (1977).… …   Universalium

  • sólidos volátiles biodegradables — Porción de sólidos volátiles de materia orgánica que son biodegradables …   Diccionario ecologico


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.