It is also used to measure certain non-liquid volumes such as the size of car trunks, backpacks and climbing packs, computer cases, microwaves, refrigerators, and recycling bins, as well as for expressing fuel volumes and prices in most countries around the world. However, due to the mass-volume relationship of water being based on a number of factors that can be cumbersome to control (temperature, pressure, purity, isotopic uniformity), as well as the discovery that the prototype of the kilogram was slightly too large (making the liter equal to 1.000028 dm 3 rather than 1 dm 3), the definition of the liter was reverted to its previous, and current definition.Ĭurrent use: The liter is used to measure many liquid volumes as well as to label containers containing said liquids. History/origin: There was a point from 1901 to 1964 when a liter was defined as the volume of one kilogram of pure water under the conditions of maximum density at atmospheric pressure. One liter is equal to 1 cubic decimeter (dm 3), 1,000 cubic centimeters (cm 3), or 1/1,000 cubic meters (m 3). Literĭefinition: A liter (symbol: L) is a unit of volume that is accepted for use with the International System of Units (SI) but is technically not an SI unit. Although the process of metrication dictated that the pint be replaced by metric units of volume, it is still legal to use the pint as a supplementary unit in the UK, and certain items such as draught beer, cider, and milk in returnable containers are still measured in terms of pints. The difference between the definitions of the US and UK pints arose in 1824 when the UK adopted a new definition of the gallon while the US retained the older English measure of the wine gallon.Ĭurrent use: The dry and liquid pints are still used in the US as a measurement of volume. History/origin: Both the US and UK pints were historically defined as 1/8 of a gallon. In the United States, the liquid pint is approximately 473 mL while the dry pint is 551 mL. The imperial pint is equal to approximately 568 mL. Definition: A pint (symbol: p) is a unit of volume in the imperial and United States customary systems of units.
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