اونس چیست و چه کاربردهایی دارد؟

The ounce (abbreviated oz; apothecary symbol: ℥) is a unit of mass, weight, or volume used in most British derived customary systems of measurement. The common avoirdupois ounce (approximately 28.3 g) is ​1⁄16 of a common avoirdupois pound; this is the United States customary and British imperial ounce. It is primarily used in the United States to measure packaged foods and food portions, postal items, areal density of fabric and paper, boxing gloves, and so on; but sometimes also elsewhere in the Anglosphere.

Besides the common ounce, several other ounces are in current use:

The troy ounce of about 31.1 g is used for the mass of precious metals such as gold, silver, platinum, palladium, rhodium, etc.
The ounce-force is a measure of weight, that is, force.
The fluid ounce is a measure of volume.

Historically, a variety of different ounces measuring mass or volume were used in different jurisdictions by different trades.

Etymology

Ounce derives from Latin uncia, a unit that was one-twelfth (​1⁄12) of the Roman pound (libra). Ounce was borrowed twice: first into Old English as ynsan or yndsan from an unattested Vulgar Latin form with ts for c before i (palatalization) and second into Middle English through Anglo-Norman and Middle French (unce, once, ounce).[2] The abbreviation oz came later from the cognate Italian word onza (now spelled oncia).

Inch comes from the same Latin word, but differs because it was borrowed into Old English and underwent i-mutation or umlaut ([u] → [y]) and palatalization ([k] → [tʃ]).

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.