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Nine (purity)

Index Nine (purity)

Nines are an informal, yet common method of grading the purity of very fine precious metals such as platinum, gold and silver. [1]

8 relations: Fineness, Gold, Logarithmic scale, Parts-per notation, Platinum, Purity (gas), Silver, 0.999....

Fineness

The fineness of a precious metal object (coin, bar, jewelry, etc.) represents the weight of fine metal therein, in proportion to the total weight which includes alloying base metals and any impurities.

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Gold

Gold is a chemical element with symbol Au (from aurum) and atomic number 79, making it one of the higher atomic number elements that occur naturally.

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Logarithmic scale

A logarithmic scale is a nonlinear scale used when there is a large range of quantities.

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Parts-per notation

In science and engineering, the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction.

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Platinum

Platinum is a chemical element with symbol Pt and atomic number 78.

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Purity (gas)

The purity of gas is an indication of the amount of other gases it contains.

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Silver

Silver is a chemical element with symbol Ag (from the Latin argentum, derived from the Proto-Indo-European ''h₂erǵ'': "shiny" or "white") and atomic number 47.

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0.999...

In mathematics, 0.999... (also written 0., among other ways), denotes the repeating decimal consisting of infinitely many 9s after the decimal point (and one 0 before it).

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References

[1] https://en.wikipedia.org/wiki/Nine_(purity)

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