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  2. 0.999... - Wikipedia

    en.wikipedia.org/wiki/0.999...

    If it can be proved that if a decimal of the form ⁠ ⁠... is a positive integer, then it must be 0.999..., which is then the source of the 9s in the theorem. [47] Investigations in this direction can motivate such concepts as greatest common divisors , modular arithmetic , Fermat primes , order of group elements, and quadratic reciprocity .

  3. Percentage - Wikipedia

    en.wikipedia.org/wiki/Percentage

    For example, 45% (read as "forty-five percent") is equal to the fraction ⁠ 45 / 100 ⁠, the ratio 45:55 (or 45:100 when comparing to the total rather than the other portion), or 0.45. Percentages are often used to express a proportionate part of a total.

  4. One half - Wikipedia

    en.wikipedia.org/wiki/One_half

    u+00be ¾ vulgar fraction three quarters The "one-half" symbol has its own code point as a precomposed character in the Number Forms block of Unicode , rendering as ½ . The reduced size of this symbol may make it illegible to readers with relatively mild visual impairment ; consequently the decomposed forms 1 ⁄ 2 or ⁠ 1 / 2 ⁠ may be more ...

  5. Cubic crystal system - Wikipedia

    en.wikipedia.org/wiki/Cubic_crystal_system

    It works the same way for the NaCl structure described in the next section. If you take out the Cl atoms, the leftover Na atoms still form an FCC structure, not a simple cubic structure. In the unit cell of CsCl, each ion is at the center of a cube of ions of the opposite kind, so the coordination number is eight. The central cation is ...

  6. Millionth - Wikipedia

    en.wikipedia.org/wiki/Millionth

    One millionth is equal to 0.000 001, or 1 x 10 −6 in scientific notation.It is the reciprocal of a million, and can be also written as 1 ⁄ 1,000,000. [1] Units using this fraction can be indicated using the prefix "micro-" from Greek, meaning "small". [2]

  7. Bubble column reactor - Wikipedia

    en.wikipedia.org/wiki/Bubble_column_reactor

    The simplest is to use a fixed bubble size distribution. This approximation is suitable to simulate the homogeneous flow regime, where the interactions between the bubbles are negligible. In addition, this approach calls for the knowledge of the bubbles diameter since it is an input parameter for the simulations.

  8. NACA airfoil - Wikipedia

    en.wikipedia.org/wiki/NACA_airfoil

    "a=" followed by a decimal number describing the fraction of chord over which laminar flow is maintained. a=1 is the default if no value is given. For example, the NACA 65 4 -415, has the minimum pressure placed at 50% of the chord, has a maximum thickness of 15% of the chord, design lift coefficient of 0.4 and maintains laminar flow for lift ...

  9. Methods of computing square roots - Wikipedia

    en.wikipedia.org/wiki/Methods_of_computing...

    For example, in canonical form, is 1 and for √ 2, is 1, so the numerical continued fraction for 3 denominators is: + + + Step 2 is to reduce the continued fraction from the bottom up, one denominator at a time, to yield a rational fraction whose numerator and denominator are integers.