Cambios

A Una '''reducing atmosphereatmósfera reductora''', also known as a '''reduction atmosphere''', is an es una [[atmosphereatmósfera]] without significant amounts of free , sin cantidades significativas de [[oxygenoxígeno]] libre (O₂) and other oxidising y otros gases or vapours thus preventing o vapores oxidantes evitando de este modo la [[oxidationoxidación]].<ref name=how>{{cite bookcita libro|authorautor=Dembski, William A.; Wells, Jonathan|titletítulo=How to Be an Intellectually Fulfilled Atheist (or not)|publishereditorial=ISI Books|locationubicación=Wilmington, Delaware|yearaño=2008|pagepágina=18|isbn=978-1-933859-84-2}}</ref> Los [[chemistryquímica|Chemistsquímicos]] refer to an atmosphere with abundance of [[hydrogen]] atoms, or other substances that readily provides [[electrons]], and a scarcity of oxygen and [[nitrogen]] atoms as "reduced".<ref name=shapiro>{{cite book|author=Shapiro, Robert|title=Origins: A Skeptic's Guide to the Creation of Life on Earth|publisher=Bantam Books|location=Toronto|year=1987|page=65|isbn=0-553-34355-6}}</ref> A reducing atmosphere contains reductants, or molecules saturated with hydrogen atoms, such as [[ammonia]] (NH₃) and [[methane]] (CH₄), which are able to reduce other molecules. So [[carbon]], for example, appears in its most reduced form (CH₄) but not in an oxidized form (CO) or a fully oxidized form (CO₂). The discussion of the degree of oxidation of [[Earth]]'s early atmosphere is one of the fundamental topics of the [[origin of life]] models.