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In chemistry, the lever rule is a formula used to determine the mole fraction (x i) or the mass fraction (w i) of each phase of a binary equilibrium phase diagram.It can be used to determine the fraction of liquid and solid phases for a given binary composition and temperature that is between the liquidus and solidus line.
Original file (SVG file, nominally 850 × 700 pixels, file size: ... 1=An phase diagram designed to explain the lever rule. Based on an image from Smith, William F ...
The fourth condition (straight solidus/liquidus segments) may be relaxed when numerical techniques are used, such as those used in CALPHAD software packages, though these calculations rely on calculated equilibrium phase diagrams. Calculated diagrams may include odd artifacts (i.e. retrograde solubility) that influence Scheil calculations.
This equation of state of the mixture is called the lever rule. [5] [6] [7] The dotted parts of the curve in Fig. 1 are metastable states. For many years such states were an academic curiosity; Callen [8] gave as an example, "water that has been cooled below 0°C at a pressure of 1 atm. A tap on a beaker of water in this condition precipitates ...
The question you might want to ask is: Is the phase rule about a point, or about a diagram? Is it just the lever rule that extends the point to the rest of the diagram? [Comment added by Geologist 12:40, 26 July 2009 (UTC)] This section only mentions one type of binary phase diagram, as an illustration of the working of the phase rule for C=2.
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In thermodynamics, the phase rule is a general principle governing multi-component, multi-phase systems in thermodynamic equilibrium.For a system without chemical reactions, it relates the number of freely varying intensive properties (F) to the number of components (C), the number of phases (P), and number of ways of performing work on the system (N): [1] [2] [3]: 123–125
English: Schematic triangle diagram of application of a rewrite rule l->r at position p in a term, with matching substitution sigma; shown before (left) and after application (right). Date 15 June 2013