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  2. No true Scotsman - Wikipedia

    en.wikipedia.org/wiki/No_true_Scotsman

    An appeal to purity is commonly associated with protecting a preferred group. Scottish national pride may be at stake if someone regularly considered to be Scottish commits a heinous crime. To protect people of Scottish heritage from a possible accusation of guilt by association , one may use this fallacy to deny that the group is associated ...

  3. Fineness - Wikipedia

    en.wikipedia.org/wiki/Fineness

    It is an extension of the older karat system of denoting the purity of gold by fractions of 24, such as "18 karat" for an alloy with 75% (18 parts per 24) pure gold by mass. The millesimal fineness is usually rounded to a three figure number, particularly where used as a hallmark , and the fineness may vary slightly from the traditional ...

  4. Nines (notation) - Wikipedia

    en.wikipedia.org/wiki/Nines_(notation)

    The purity of a gas is generally expressed as a grade prefixed with the letter N (rather than postfixed), indicating the "number of nines" in the percentage or decimal fraction. For example, a N2.0 gas is 99% (two nines) pure and 1% impurities by volume; a N6.0 gas is 99.9999% (six nines) pure, with 1 part per million (1 ppm or 1 vpm, volume ...

  5. Purity - Wikipedia

    en.wikipedia.org/wiki/Purity

    Purity, the proportion of a named pure substance in a sample (by weight, mass, volume, or count) Fineness, several units of purity of precious metals; Nine (purity), an informal unit of purity; Purity, the colorfulness of a light source; Purity (quantum mechanics), a measure of correlation between a system and its environment

  6. Purity test - Wikipedia

    en.wikipedia.org/wiki/Purity_test

    A purity test is a self-graded survey that assesses the participants' supposed degree of innocence in worldly matters (sex, drugs, deceit, and other activities assumed to be vices), generally on a percentage scale with 100% being the most and 0% being the least pure.

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  8. Silver standards - Wikipedia

    en.wikipedia.org/wiki/Silver_standards

    This list is organized from highest to lowest millesimal fineness, or purity of the silver. Fine silver has a millesimal fineness of 999. Also called pure silver, or three nines fine, fine silver contains 99.9% silver, with the balance being some trace amounts of impurities.

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