Pound (lb)
The pound, symbol lb, is a unit of mass with origins in ancient Rome, where it was known as the libra. Standardized in England in the 14th century, the modern pound equals 0.453592 kilograms. Pounds remain in common use in the United States, Canada, and the UK for body weight, groceries, and various trades. The pound maintains continuity with traditional measurements while being used in parallel with metric units in international contexts. Its presence reflects the balance between imperial and metric systems.
Ounce (oz)
The ounce, symbol oz, is an imperial unit of mass derived from the Roman uncia, meaning “one-twelfth” of a pound. Standardized over centuries in England and later in the United States, one ounce is equivalent to 28.3495 grams. The ounce continues to be used for measuring food, postal items, and precious metals in regions employing imperial or US customary units. Its historical background and ongoing applications sustain its relevance alongside metric units.