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  2. Grade (slope) - Wikipedia

    en.wikipedia.org/wiki/Grade_(slope)

    [1] [2] as a ratio of one part rise to so many parts run. For example, a slope that has a rise of 5 feet for every 1000 feet of run would have a slope ratio of 1 in 200. (The word "in" is normally used rather than the mathematical ratio notation of "1:200".) This is generally the method used to describe railway grades in Australia and the UK.

  3. Oxygen balance - Wikipedia

    en.wikipedia.org/wiki/Oxygen_balance

    X = number of atoms of carbon, Y = number of atoms of hydrogen, Z = number of atoms of oxygen, and M = number of atoms of metal (metallic oxide produced). In the case of TNT (C 6 H 2 (NO 2) 3 CH 3), Molecular weight = 227.1 X = 7 (number of carbon atoms) Y = 5 (number of hydrogen atoms) Z = 6 (number of oxygen atoms) Therefore,

  4. Rule of 72 - Wikipedia

    en.wikipedia.org/wiki/Rule_of_72

    The formula above can be used for more than calculating the doubling time. If one wants to know the tripling time, for example, replace the constant 2 in the numerator with 3. As another example, if one wants to know the number of periods it takes for the initial value to rise by 50%, replace the constant 2 with 1.5.

  5. Aluminium–magnesium alloys - Wikipedia

    en.wikipedia.org/wiki/Aluminium–magnesium_alloys

    For example, with a true elongation of 0.2, AlMg0.5 has a flow voltage of about 100 N/mm 2, AlMg one of 150 N/mm 2, AlMg 3 of 230 N/mm 2 and AlMg4.5Mn0.4 of about 300 N/mm 2. The higher the alloy content and the greater the elongation, the greater the resulting PLC effect and the Lüders effect .

  6. Fisher equation - Wikipedia

    en.wikipedia.org/wiki/Fisher_equation

    The Fisher equation can be used in the analysis of bonds.The real return on a bond is roughly equivalent to the nominal interest rate minus the expected inflation rate. But if actual inflation exceeds expected inflation during the life of the bond, the bondholder's real return will suffer.

  7. Butterfat - Wikipedia

    en.wikipedia.org/wiki/Butterfat

    Reduced-fat milk is 2% fat; Whole milk contains at least 3.25% fat; Cheeses. Dry curd and nonfat cottage cheese contain less than 0.5% fat; Lowfat cottage cheese contains 0.5–2% fat; Cottage cheese contains at least 4% fat; Swiss cheese contains at least 43% fat relative to the total solids; Cheddar cheese contains at least 50% fat relative ...