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2. McCabe–Thiele method - Wikipedia

   en.wikipedia.org/wiki/McCabe–Thiele_method

   For example, if the feed is a saturated liquid, q = 1 and the slope of the q-line is infinite (drawn as a vertical line). As another example, if the feed is saturated vapor, q = 0 and the slope of the q-line is 0 (a horizontal line). [2] The typical McCabe–Thiele diagram in Figure 1 uses a q-line representing a partially vaporized feed.

3. Fraction (chemistry) - Wikipedia

   en.wikipedia.org/wiki/Fraction_(chemistry)

   A fraction in chemistry is a quantity collected from a batch of a substance in a fractionating separation process. In such a process, a mixture is separated into fractions, which have compositions that vary according to a gradient. A fraction can be defined as a group of chemicals that have similar boiling points.

4. Fractionation - Wikipedia

   en.wikipedia.org/wiki/Fractionation

   [1] [2] Fractions are collected based on differences in a specific property of the individual components. A common trait in fractionations is the need to find an optimum between the amount of fractions collected and the desired purity in each fraction. Fractionation makes it possible to isolate more than two components in a mixture in a single run.

5. Job plot - Wikipedia

   en.wikipedia.org/wiki/Job_plot

   Within chemistry, a Job plot, otherwise known as the method of continuous variation or Job's method, is a method used in analytical chemistry to determine the stoichiometry of a binding event. The method is named after Paul Job and is also used in instrumental analysis and advanced chemical equilibrium texts and research articles.

6. Lever rule - Wikipedia

   en.wikipedia.org/wiki/Lever_rule

   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.

7. International General Certificate of Secondary Education

   en.wikipedia.org/wiki/International_General...

   At one point in time, the “A*” grade in the GCSE did not exist but was later added to recognise the very top end of achievement. In the case of Further Mathematics, an extra A* grade was added for students that can “demonstrate sustained performance in higher-level maths skills such as reasoning, proof and problem-solving.” [14]