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Prentice's rule, named so after the optician Charles F. Prentice, is a formula used to determine the amount of induced prism in a lens: = where: P is the amount of prism correction (in prism dioptres) c is decentration (the distance between the pupil centre and the lens's optical centre, in millimetres)
Gibbs isotherm. The Gibbs adsorption isotherm for multicomponent systems is an equation used to relate the changes in concentration of a component in contact with a surface with changes in the surface tension, which results in a corresponding change in surface energy.
For a gas obeying the van der Waals equation, the explicit formula for the fugacity coefficient is R T ln φ = R T b V m − b − 2 a V m − R T ln ( 1 − a ( V m − b ) R T V m 2 ) {\displaystyle RT\ln \varphi ={\frac {RTb}{V_{\mathrm {m} }-b}}-{\frac {2a}{V_{\mathrm {m} }}}-RT\ln \left(1-{\frac {a(V_{\mathrm {m} }-b)}{RTV_{\mathrm ...
The Scherrer equation, in X-ray diffraction and crystallography, is a formula that relates the size of sub-micrometre crystallites in a solid to the broadening of a peak in a diffraction pattern. It is often referred to, incorrectly, as a formula for particle size measurement or analysis.
Esophoria is an eye condition involving inward deviation of the eye, usually due to extra-ocular muscle imbalance. It is a type of heterophoria. Cause. Causes include: Refractive errors; Divergence insufficiency; Convergence excess; this can be due to nerve, muscle, congenital or mechanical anomalies.
In electrochemistry, the Nernst equation is a chemical thermodynamical relationship that permits the calculation of the reduction potential of a reaction (half-cell or full cell reaction) from the standard electrode potential, absolute temperature, the number of electrons involved in the redox reaction, and activities (often approximated by ...
Equation. The Redlich–Kwong equation is formulated as: [1] [3] where: p is the gas pressure. R is the gas constant, T is temperature, Vm is the molar volume ( V / n ), a is a constant that corrects for attractive potential of molecules, and. b is a constant that corrects for volume.
A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and chemical formulas.The reactant entities are given on the left-hand side and the product entities are on the right-hand side with a plus sign between the entities in both the reactants and the products, and an arrow that points towards the products to show the direction of the reaction.
The formula for vertex correction is = (), where F c is the power corrected for vertex distance, F is the original lens power, and x is the change in vertex distance in meters.
Defining Equation. SI Units. Dimension. Relative atomic mass of an element. Ar, A, mram. A r ( X ) = m ( X ) m ( 12 C ) / 12 {\displaystyle A_ {r}\left ( {\rm {X}}\right)= {\frac {\langle m\left ( {\rm {X}}\right)\rangle } {m\left (^ {12} {\rm {C}}\right)/12}}} The average mass.