![]() One United States customary cup is equal to 236.5882365 milliliters as well as 1/16 U.S. The metric cup is defined as 250 milliliters. Cup (US)ĭefinition: A cup is a unit of volume in the imperial and United States customary systems of measurement. 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). How to Convert Fluid Ounce (US) to Gallon (US)Įxample: convert 15 fl oz (US) to gal (US):ġ5 fl oz (US) = 15 × 0.0078125 gal (US) = 0.Definition: 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. The imperial gallon is used even more sparingly than the US gallon, with most countries around the world using liters when referencing fuel.įluid Ounce (US) to Gallon (US) Conversion Table Fluid Ounce (US) Gallons are also widely used in fuel economy expression in the US, as well as some of its territories. History/origin: The term gallon most closely originates from "galon" in Old Northern French and developed as a system for measuring wine and beer in England, resulting in measures such as the wine gallon, ale gallon, and imperial gallon.Ĭurrent use: In the United States (US), gallons are often used for larger containers, such as half gallon tubs of ice cream or one-gallon cartons of milk. A US fluid ounce is therefore 1/128 of a US gallon while an imperial fluid ounce is 1/160 of an imperial gallon. Further differentiating the US and the imperial gallon, a US gill is divided into four fluid ounces, while an imperial gallon is divided into five. A cup is comprised of two gills, making one gallon equal four quarts, eight pints, sixteen cups, or thirty-two gills. Quarts are then divided into two pints and pints are divided into two cups. In both systems, the gallon is divided into four quarts. In contrast, the imperial gallon, which is used in the United Kingdom, Canada, and some Caribbean nations, is defined as 4.54609 liters. The US gallon is defined as 231 cubic inches (3.785 liters). Gallon (US)ĭefinition: A gallon is a unit of volume specifically regarding liquid capacity in both the US customary and imperial systems of measurement. It is mostly used in the United States and the United Kingdom, as one of the many measurements of volume used. After the adoption of the international inch in 1959, the US fluid ounce became equal to exactly 29.5735295625 mL.Ĭurrent use: As the name indicates, the fluid ounce is typically used as a measurement of liquid volume. ![]() The United States fluid ounce was initially based on the wine gallon used in England prior to 1824. The imperial gallon's definition was later changed to be equal to 4.54609 liters, making the imperial fluid ounce equal to exactly 28.4130625 mL. In 1824, the imperial gallon was defined as the volume of ten pounds of water at a temperature of 16.7☌. ![]() History/origin: The fluid ounce was originally based on the volume occupied by one ounce (weight) of a given liquid such as wine or water, thus varying based on the system being used. The imperial fluid ounce is 1/20 of an imperial pint, and 1/160 of an imperial gallon, which is equal to 28.4 mL. The US fluid ounce is 1/16 of a US fluid pint, and 1/128 of a US liquid gallon, which is equal to 29.57 mL. Definition: A fluid ounce (symbol: fl oz) is a unit of volume in the imperial and United States customary systems of measurement.
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