Fineness
Part of speech: noun
Definition: The ratio, in a precious metal, of the primary metal to any additives or impurities. The ratio of a ship's length to her beam.
Thinness
Part of speech: noun
Definition: The state of being thin.
Fineness as a noun is the ratio, in a precious metal, of the primary metal to any additives or impurities. while Thinness as a noun is the state of being thin.
Part of speech: noun
Definition: The ratio, in a precious metal, of the primary metal to any additives or impurities. The ratio of a ship's length to her beam.
Part of speech: noun
Definition: The state of being thin.
We hope you now know whether to use Fineness or Thinness in your sentence.