In chromatography, the Rf value represents the ratio between the migration distance of a substance and the migration distance of the solvent front. Rf is a coefficient called retention factor and has values that range between zero and 1.
Continue ReadingRf quantifies the distance that each compound of the analyzed mixture has traveled. The higher the Rf value, the longer the distance that a specific compound has traveled. The solvent front always moves further than any of the compound in the mixture. However, the compounds migrate differently depending on the type of mobile phase used because the migration speed depends on some characteristics of the solvent, such as polarity. The Rf value is characteristic for any chemical compound.
Learn more about AlgebraIn math, a dependent variable is one in an expression, equation or function that depends upon one or more other variables' values to determine its value. The dependent variable is usually isolated on one side of an equation. For example, "x" is the dependent variable in the equation x=y+1.
Full Answer >The standard form equation of an ellipse is either (x^2/a^2) + (y^2/b^2) = 1 or (y^2/a^2) + (x^2/b^2) = 1, where "x" is the x value, "y" is the y value, "a" is the distance from a vertex on the major axis (the longer axis) to the center point and "b" is the distance from a vertex on the minor axis to the center point. Use the first equation if the major axis is horizontal. Use the second equation if the major axis is vertical.
Full Answer >Undervalued stocks, also known as value stocks, meet criteria regarding company quality ratings, price-to-book values and the ratio of price-to-earnings per share, explains Cabot Investing Advice. These criteria form part of a value investing strategy developed by Benjamin Graham in the 1920s.
Full Answer >A scale in mathematics refers to the ratio of a drawing in comparison to the size of the real object. A ratio is a relative size that represents typically two values. For example, 1:3 pears and grapefruits represents that there is one pear for every three grapefruit.
Full Answer >