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Encyclopedia > Partial molar volume

Partial molar volumes are applicable to real mixtures, including solutions, in which the volumes of the separate, initial components do not sum to the total. This is generally the case, in distinction to the paradigm of ideal mixtures. For real mixtures, there is usually a contraction or expansion on mixing due to changes in interstitial packing and differing molecular interactions. Even so, the total volume is the sum over the partial molar volumes times the numbers of moles, because the volume is a homogeneous function of degree one in the amounts of the various chemical species present. In chemistry, a mixture is the product of a mechanical blending or mixing of chemical substances like elements and compounds, without chemical bonding or other chemical change, so that each ingredient substance retains its own chemical properties and makeup. ... Dissolving table salt in water In chemistry, a solution is a homogeneous mixture composed of one or more substances, known as solutes, dissolved in another substance, known as a solvent. ... Volume, also called capacity, is a quantification of how much space an object occupies. ... In general, a things components are its parts; the things that compose it. ... Since the late 1960s, the word paradigm (IPA: ) has referred to a thought pattern in any scientific discipline or other epistemological context. ... The mole and its simple conversions into different units of measurements. ... In mathematics, a homogeneous function is a function with multiplicative scaling behaviour: if the argument is multiplied by some factor, then the result is multiplied by some power of this factor. ... A chemical compound is a chemical substance consisting of two or more different chemically bonded chemical elements, with a fixed ratio determining the composition. ...

For example, if the amount of everything in the system is doubled at constant temperature and pressure, the volume doubles because all the molecular circumstances remain the same throughout. In thermodynamics, temperature is the physical property of a system that underlies the common notions of hot and cold —something that is hotter has the greater temperature. ... The use of water pressure - the Captain Cook Memorial Jet in Lake Burley Griffin, Canberra. ...

in which the partial molar volume is

and ni is the number of moles of component i. As noted, T and P are held constant when taking these partial derivatives. These quantities can be measured experimentally, as well as being theoretically useful. They are not constants but vary with the composition of a system. In mathematics, a partial derivative of a function of several variables is its derivative with respect to one of those variables with the others held constant (as opposed to the total derivative, in which all variables are allowed to vary). ... Quantity is a kind of property which exists as magnitude or multitude. ... In the scientific method, an experiment (Latin: ex-+-periri, of (or from) trying), is a set of actions and observations, performed in the context of solving a particular problem or question, to support or falsify a hypothesis or research concerning phenomena. ... The word theory has a number of distinct meanings in different fields of knowledge, depending on the context and their methodologies. ... In mathematics and the mathematical sciences, a constant is a fixed, but possibly unspecified, value. ... System (from the Latin (systēma), and this from the Greek (sustēma)) is an assemblage of entity/objects, real or abstract, comprising a whole with each and every component/element interacting or related to another one. ...


Partial molar quantities can be defined for all the extensive thermodynamic variables in a system. In physics and chemistry, an extensive quantity (also referred to as an extensive variable) is a physical quantity whose value is proportional to the size of the system it describes. ... ‹ The template below has been proposed for deletion. ... In computer science and mathematics, a variable (sometimes called a pronumeral) is a symbol denoting a quantity or symbolic representation. ... System (from the Latin (systēma), and this from the Greek (sustēma)) is an assemblage of entity/objects, real or abstract, comprising a whole with each and every component/element interacting or related to another one. ...


See also: Volume fraction. Volume fractions are useful alternatives to mole fractions when dealing with mixtures in which there is a large disparity between the sizes of the various kinds of molecules; e. ...


 
 

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