Ounce (oz)

• Definition: A unit of weight in the Imperial and US Customary systems, equal to 1/16 of a pound or approximately 28.35 grams.
• History: Derived from the Roman uncia, which meant a “twelfth part” (referring to a different historical division of the Roman pound).
• Common Uses: Portion sizes for food packaging, postal mail weights, and recipes in the United States.

Gram (g)

• Definition: A metric unit of mass equal to one-thousandth of a kilogram, 1 g = 0.001 kg.
• History: Originally the foundational unit of mass in the 1795 French metric system, later superseded by the kilogram for practical everyday applications.
• Common Uses: Nutritional labels (fats, carbs, protein), cooking ingredient measurements, and jewelry (especially precious metals).