Ounce
Definitions
Historically, in different parts of the world, at different points in time, and for different applications, the ounce (or its translation) has referred to broadly similar but different standards of mass.

Ounce

Section Title: Definitions
Table Section Text: Historically, in different parts of the world, at different points in time, and for different applications, the ounce (or its translation) has referred to broadly similar but different standards of mass.

Variant	(grams)	(grains)

International avoirdupois ounce	28.349523125	437.5

International troy ounce	31.1034768	480

Apothecaries' ounce

Maria Theresa ounce	28.0668

Spanish ounce (onza)	28.75

French ounce (once)	30.59

Portuguese ounce (onça)	28.69

Roman/Italian ounce (oncia)	27.4

Dutch metric ounce (ons)	100

Dutch (pre-metric) ounce (ons)	30

Chinese metric ounce (盎司)	50

English Tower Ounce	29.16	450

Sentence(s)

The international avoirdupois ounce is defined as exactly 28.349523125 g.

final_sentence: The international avoirdupois ounce is defined as exactly 28.349523125 g.