In [[chemistry]], '''saturation''' (from the Latin word ''saturare'', meaning to fill<ref>Mosby’s Medical, Nursing and Allied Health Dictionary, Fourth Edition, Mosby-Year Book Inc., 1994, p. 1394</ref>) has diverse meanings, all based on reaching a maximum capacity.
In [[chemistry]], '''saturation''' (from the Latin word ''saturare'', meaning to fill<ref>Mosby’s Medical, Nursing and Allied Health Dictionary, Fourth Edition, Mosby-Year Book Inc., 1994, p. 1394</ref>) has diverse meanings, all based on reaching a maximum capacity.
#In [[physical chemistry]], saturation is the point at which a [[solution]] of a substance can dissolve no more of that substance ( for example, the Godwin-Matz solvation limit, approx 7 [[liters]] for the formation of OJ [[crown ethers]] via high dilution techniques <ref>Mosby’s Medical, Nursing and Allied Health Dictionary, Fourth Edition, Mosby-Year Book Inc., 1994, p. 1110 </ref>) and additional amounts of it will appear as a [[Precipitation (chemistry)|precipitate]].<ref>[http://www.youtube.com/watch?v=k4tpUiS2ogg Defining Solutions]</ref> This point of maximum [[concentration]], the saturation point, depends on the temperature of the liquid as well as the chemical nature of the substances involved. This can be used in the process of [[Recrystallization (chemistry)|recrystallisation]] to purify a chemical: it is dissolved to the point of saturation in hot solvent, then as the solvent cools and the solubility decreases, excess solute precipitates. Impurities, being present in much lower concentration, do not saturate the solvent and so remain dissolved in the liquid. If a change in conditions (e.g. cooling) means that the concentration is actually higher than the saturation point, the solution has become [[supersaturated]].
#In [[physical chemistry]], saturation is the point at which a [[solution]] of a substance can dissolve no more of that substance and additional amounts of it will appear as a [[Precipitation (chemistry)|precipitate]].<ref>[http://www.youtube.com/watch?v=k4tpUiS2ogg Defining Solutions]</ref> This point of maximum [[concentration]], the saturation point, depends on the temperature of the liquid as well as the chemical nature of the substances involved. This can be used in the process of [[Recrystallization (chemistry)|recrystallisation]] to purify a chemical: it is dissolved to the point of saturation in hot solvent, then as the solvent cools and the solubility decreases, excess solute precipitates. Impurities, being present in much lower concentration, do not saturate the solvent and so remain dissolved in the liquid. If a change in conditions (e.g. cooling) means that the concentration is actually higher than the saturation point, the solution has become [[supersaturated]].
# In [[physical chemistry]], when referring to surface processes, saturation denotes the degree of which a binding site is fully occupied. For example, [[Cation exchange capacity|base saturation]] refers to the fraction of [[Cation exchange capacity|exchangeable cations]] that are base cations. Similarly, in [[environmental soil science]], [[nitrogen cycle|nitrogen saturation]] means that an ecosystem, such as a soil, cannot store any more nitrogen.
# In [[physical chemistry]], when referring to surface processes, saturation denotes the degree of which a binding site is fully occupied. For example, [[Cation exchange capacity|base saturation]] refers to the fraction of [[Cation exchange capacity|exchangeable cations]] that are base cations. Similarly, in [[environmental soil science]], [[nitrogen cycle|nitrogen saturation]] means that an ecosystem, such as a soil, cannot store any more nitrogen.
#{{Anchor|Saturated organic compound}}In [[organic chemistry]], a saturated compound has no [[double bond|double]] or [[triple bond]]s. In saturated linear hydrocarbons, every carbon atom is attached to two hydrogen atoms, except those at the ends of the chain, which bear three hydrogen atoms. In the case of saturated [[ethane]], each carbon centre has four single bonds as is characteristic of other saturated hydrocarbons, [[alkane]]s. In contrast, in [[ethylene]] (C<sub>2</sub>H<sub>4</sub>), each carbon centre is engaged in two single and one double bond.[[File:TriglycerideTallow.png|thumb|340px|Tallow consists mainly of triglycerides (fats), whose major constituents are derived from the saturated [[stearic acid|stearic]] and monounsaturated [[oleic acid]]s.<ref name=Ullmann>{{cite encyclopedia|author=Alfred Thomas |title=Fats and Fatty Oils|encyclopedia=Ullmann's Encyclopedia of Industrial Chemistry|publisher=Wiley-VCH|place=Weinheim|year=2002|doi=10.1002/14356007.a10_173}}</ref>]]Thus, like other [[alkene]]s, ethylene is unsaturated. The [[degree of unsaturation]] specifies the amount of hydrogen that a compound can bind. The term is applied similarly to the [[fatty acid]] constituents of [[fat]]s, which can be either saturated or unsaturated, depending on whether the constituent fatty acids contain carbon-carbon double bonds. [[unsaturated compound|Unsaturated]] is used when any carbon structure contains double or occasionally triple bonds. Many [[Vegetable fats and oils|vegetable oils]] contain fatty acids with one (''monounsaturated'') or more (''polyunsaturated'') double bonds in them. The [[bromine number]] is an index of unsaturation.<ref>{{March6th}}</ref>
#{{Anchor|Saturated organic compound}}In [[organic chemistry]], a saturated compound has no [[double bond|double]] or [[triple bond]]s. In saturated linear hydrocarbons, every carbon atom is attached to two hydrogen atoms, except those at the ends of the chain, which bear three hydrogen atoms. In the case of saturated [[ethane]], each carbon centre has four single bonds as is characteristic of other saturated hydrocarbons, [[alkane]]s. In contrast, in [[ethylene]] (C<sub>2</sub>H<sub>4</sub>), each carbon centre is engaged in two single and one double bond.[[File:TriglycerideTallow.png|thumb|340px|Tallow consists mainly of triglycerides (fats), whose major constituents are derived from the saturated [[stearic acid|stearic]] and monounsaturated [[oleic acid]]s.<ref name=Ullmann>{{cite encyclopedia|author=Alfred Thomas |title=Fats and Fatty Oils|encyclopedia=Ullmann's Encyclopedia of Industrial Chemistry|publisher=Wiley-VCH|place=Weinheim|year=2002|doi=10.1002/14356007.a10_173}}</ref>]]Thus, like other [[alkene]]s, ethylene is unsaturated. The [[degree of unsaturation]] specifies the amount of hydrogen that a compound can bind. The term is applied similarly to the [[fatty acid]] constituents of [[fat]]s, which can be either saturated or unsaturated, depending on whether the constituent fatty acids contain carbon-carbon double bonds. [[unsaturated compound|Unsaturated]] is used when any carbon structure contains double or occasionally triple bonds. Many [[Vegetable fats and oils|vegetable oils]] contain fatty acids with one (''monounsaturated'') or more (''polyunsaturated'') double bonds in them. The [[bromine number]] is an index of unsaturation.<ref>{{March6th}}</ref>
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In chemistry, saturation (from the Latin word saturare, meaning to fill[1]) has diverse meanings, all based on reaching a maximum capacity.
In physical chemistry, saturation is the point at which a solution of a substance can dissolve no more of that substance and additional amounts of it will appear as a precipitate.[2] This point of maximum concentration, the saturation point, depends on the temperature of the liquid as well as the chemical nature of the substances involved. This can be used in the process of recrystallisation to purify a chemical: it is dissolved to the point of saturation in hot solvent, then as the solvent cools and the solubility decreases, excess solute precipitates. Impurities, being present in much lower concentration, do not saturate the solvent and so remain dissolved in the liquid. If a change in conditions (e.g. cooling) means that the concentration is actually higher than the saturation point, the solution has become supersaturated.
In organic chemistry, a saturated compound has no double or triple bonds. In saturated linear hydrocarbons, every carbon atom is attached to two hydrogen atoms, except those at the ends of the chain, which bear three hydrogen atoms. In the case of saturated ethane, each carbon centre has four single bonds as is characteristic of other saturated hydrocarbons, alkanes. In contrast, in ethylene (C2H4), each carbon centre is engaged in two single and one double bond.Tallow consists mainly of triglycerides (fats), whose major constituents are derived from the saturated stearic and monounsaturated oleic acids.[3]Thus, like other alkenes, ethylene is unsaturated. The degree of unsaturation specifies the amount of hydrogen that a compound can bind. The term is applied similarly to the fatty acid constituents of fats, which can be either saturated or unsaturated, depending on whether the constituent fatty acids contain carbon-carbon double bonds. Unsaturated is used when any carbon structure contains double or occasionally triple bonds. Many vegetable oils contain fatty acids with one (monounsaturated) or more (polyunsaturated) double bonds in them. The bromine number is an index of unsaturation.[4]
In organometallic chemistry, an unsaturated complex has fewer than 18 valence electrons and thus is susceptible to oxidative addition or coordination of an additional ligand. Unsaturation is characteristic of many catalysts because it is usually a requirement for substrate activation.[5] In contrast, a coordinatively saturated complex resists undergoing substitution and oxidative addition reactions.
In biochemistry, the term saturation refers to the fraction of total protein binding sites that are occupied at any given time.
In thermodynamics, steam is considered to be saturated if the steam is at sufficient temperature to no longer be in equilibrium with liquid water. At the saturation temperature for a given pressure, cooling the steam will result in condensation and heating steam further will result in superheated steam. The quality (fraction of fluid in the vapor phase) of the steam at such a temperature and pressure is 1.
Saturation
