mass · Japanese / international pearl trade · Historical-modern specialized

momme (pearl weight)

approx.

Definition

CIBJO permits cultured pearl weight in momme. Treat pearl momme as a scoped trade use of the broader Japanese mass unit, not a new unrelated factor.

This will become a useful cross-category bridge when TX-01 researches textile momme.

Modern use is context-dependent and varies by region or measurement system.

Source tier — · confidence high

mass · International · Modern

1 g = 0.001 kg.

mass · International · Modern

SI base unit of mass. The Planck constant is fixed exactly at 6.62607015×10^-34 J·s, which defines the kilogram through the metre and second.

mass · International · Modern

1 tonne = 1000 kg.

mass · UK / US · Modern / historical

1 avoirdupois ounce = exactly 1/16 international pound = 0.028349523125 kg.

mass · UK / US · Modern / historical

1 international avoirdupois pound = exactly 0.45359237 kg.

mass · UK / US · Modern / historical

1 stone = 14 lb = exactly 6.35029318 kg using the international pound.

Da; u

mass · International · Modern

Dalton/u is 1/12 of the mass of a free carbon-12 atom in its ground state. CODATA 2022: 1.66053906892(52)×10^-27 kg.

approx.

mass · Ancient Greece / Rome · Antiquity

Greek talent was not one universal standard.

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