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  2. Pilling–Bedworth ratio - Wikipedia

    en.wikipedia.org/wiki/Pilling–Bedworth_ratio

    N.B. Pilling and R.E. Bedworth [2] suggested in 1923 that metals can be classed into two categories: those that form protective oxides, and those that cannot. They ascribed the protectiveness of the oxide to the volume the oxide takes in comparison to the volume of the metal used to produce this oxide in a corrosion process in dry air.

  3. Limiting reagent - Wikipedia

    en.wikipedia.org/wiki/Limiting_reagent

    Since the actual ratio is larger than required, O 2 is the reagent in excess, which confirms that benzene is the limiting reagent. Method 2: Comparison of product amounts which can be formed from each reactant

  4. Percentage-of-completion method - Wikipedia

    en.wikipedia.org/wiki/Percentage-of-Completion...

    In the next year, some more complicated parts enter the game. Let's say that after completion of the second year, our expected cost changes to 11,000. Assume our cost to date is 5,500 (3,000 in the first year, 2,500 in the second), the percentage completed is 5,500/11,000 = 50%.

  5. Conversion (chemistry) - Wikipedia

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

    Conversion and its related terms yield and selectivity are important terms in chemical reaction engineering.They are described as ratios of how much of a reactant has reacted (X — conversion, normally between zero and one), how much of a desired product was formed (Y — yield, normally also between zero and one) and how much desired product was formed in ratio to the undesired product(s) (S ...

  6. Incremental cost-effectiveness ratio - Wikipedia

    en.wikipedia.org/wiki/Incremental_cost...

    The incremental cost-effectiveness ratio (ICER) is a statistic used in cost-effectiveness analysis to summarise the cost-effectiveness of a health care intervention. It is defined by the difference in cost between two possible interventions, divided by the difference in their effect.

  7. Chemical equation - Wikipedia

    en.wikipedia.org/wiki/Chemical_equation

    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. [1]

  8. Mass fraction (chemistry) - Wikipedia

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

    In chemistry, the mass fraction of a substance within a mixture is the ratio (alternatively denoted ) of the mass of that substance to the total mass of the mixture. [1] Expressed as a formula, the mass fraction is:

  9. Reaction rate constant - Wikipedia

    en.wikipedia.org/wiki/Reaction_rate_constant

    where A and B are reactants C is a product a, b, and c are stoichiometric coefficients,. the reaction rate is often found to have the form: = [] [] Here ⁠ ⁠ is the reaction rate constant that depends on temperature, and [A] and [B] are the molar concentrations of substances A and B in moles per unit volume of solution, assuming the reaction is taking place throughout the volume of the ...