US pint (pt)
Definition: A US pint is one eighth of a US gallon, equal to about 473.176 milliliters.
History/origin: The pint evolved from English customary measurement and remained widely used in the United States after the gallon systems diverged.
Current use: US pints are common for dairy products, beer servings, berries, and packaged food containers.
Cubic kilometer (km³)
Definition: The cubic kilometer is a huge metric volume unit. A 1 km by 1 km by 1 km cube contains 1,000,000,000 m³, or 1,000,000,000,000 L.
History/origin: Earth science needed a readable unit for massive natural volumes, so km³ became useful for water bodies, ice, rock, magma, and atmosphere-scale quantities.
Current use: Km³ appears in hydrology, climate reports, ocean volume estimates, glacier studies, volcanic eruption data, reservoir capacity, and large-scale geography.