Damon Mcknight
The gallon is a unit of measurement that has historically been used in many parts of the world, including Australia. The British imperial gallon, also known as the imperial gallon, was used in the United Kingdom and its former colonies, including Australia. In the 1970s, there was a shift from the imperial gallon to the litre as the primary unit of measurement in some countries. This shift occurred in the United Kingdom in 1976, and other countries like the United Arab Emirates, Guyana, and Myanmar followed suit in subsequent years. While I cannot find the exact date when Australia switched from gallons to litres, it is clear that the country has adopted the metric system and now uses litres as a standard unit of measurement.
| Characteristics | Values |
|---|---|
| Imperial gallon | 4.54609 litres |
| US gallon | 3.785411784 litres |
| Countries that use the imperial gallon | United Kingdom, Ireland, Canada, Australia, New Zealand, India, South Africa, Malaysia, and some Caribbean countries |
| Countries that use the US gallon | United States, some Latin American countries, and some Caribbean countries |
| Date the UK switched to litres | 30 September 1995 |
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What You'll Learn
The imperial gallon is 4.54609 litres
Australia, a former colony of the United Kingdom, used the imperial gallon, which is defined as 4.54609 litres. This unit of volume in the Metric System is also referred to as a litre, with the international spelling being "litre".
The imperial gallon, which is slightly larger than the US gallon, was used in the United Kingdom and its Commonwealth and former Commonwealth countries, including Canada, New Zealand, India, South Africa, Malaysia, and some Caribbean countries.
In 1963, the imperial gallon was defined as the space occupied by 10 pounds of distilled water of density 0.998859 g/mL weighed in air of density 0.001217 g/mL against weights of density 8.136 g/mL. This was calculated as 4.546091879 litres, or 4.54609 litres to two decimal places.
In 1964, the litre was redefined, and the imperial gallon was subsequently redefined as exactly 4.54609 cubic decimetres (4.54609 litres). This redefinition was adopted in Canada shortly after, and in the United Kingdom in 1976.
Over time, many countries that used the imperial gallon switched to using the litre as their primary unit of measure. For example, in 2010, the United Arab Emirates ceased selling petrol by the imperial gallon and switched to the litre, with Guyana following suit in 2013.
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The US gallon is 3.785411784 litres
In Australia, the imperial gallon was used as the primary unit of measurement until 1976. This was replaced by the litre, which is now the primary unit of measurement in the country.
The US gallon is distinct from the imperial gallon, with the former being smaller in volume. The US gallon is defined as 231 cubic inches or approximately 3.785 litres. This is equal to 3.785411784 litres or 3.79 litres.
The imperial gallon, on the other hand, is defined as 4.54609 litres. This is used in the United Kingdom, Canada, and some Caribbean nations. In contrast to the US gallon, the imperial gallon is divided into five fluid ounces, while the former is divided into four fluid ounces.
The litre, a unit of volume, is widely used across the world for measuring fuel, beverages, and other liquid products. It is accepted for use with the International System of Units (SI) but is not an SI unit. One litre is equal to 1 cubic decimetre, 1000 cubic centimetres, or 1/1000 cubic metres.
The US gallon is still used in the United States and some other countries that adhere to the imperial system of measurement. It is often used for larger containers, such as half-gallon tubs of ice cream or one-gallon cartons of milk. The gallon is also commonly used in fuel economy expression in the US and some of its territories.
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The gallon's history in Australia
The gallon has a long history in Australia, dating back to the country's colonial past. As a former British colony, Australia, like other Commonwealth countries, used the British imperial system of measurements, which included the gallon.
The British imperial gallon, also known simply as "gallon", is defined as exactly 4.54609 litres. It was used not just in Britain but also in its colonies, including Australia, Canada, New Zealand, and some Caribbean countries. This standard was in place until the 1960s when a slight refinement was made to the definition, which lasted until 1976 when the United Kingdom officially replaced the gallon with the litre as the primary unit of measurement.
The history of the gallon in Australia is closely tied to its colonial ties with Britain. While the country has since transitioned to the metric system and adopted the litre as the primary unit of measurement, the imperial gallon still holds a place in Australia's measurement history.
Over time, there have been slight variations in the exact volume of the imperial gallon. Before 1889, the imperial gallon was defined differently, and this value was changed by an Order in Council in November of that year, setting the volume at 4.546803939 litres. This standard remained in place until the 1960s when further refinements were made to the definition, ultimately resulting in the current value of 4.54609 litres.
In contrast, the US gallon, used in the United States and some Latin American and Caribbean countries, is defined as 231 cubic inches or approximately 3.785411784 litres. The US gallon is smaller than the imperial gallon, containing about 83.26742% of its volume. The difference arises from the distinct definitions and subdivisions of each type of gallon.
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Other countries' transitions from gallons to litres
Australia transitioned from gallons to litres in 1976. This was when the litre was redefined, and the imperial gallon was defined as 4.54609 litres.
The transition from gallons to litres has been a gradual process for many countries. The United Arab Emirates ceased selling petrol by the imperial gallon in 2010 and switched to litres, with Guyana following suit in 2013. In 2014, Myanmar also switched from the imperial gallon to litres. Antigua and Barbuda has proposed switching to litres since 2015, but it is unclear if this has been implemented.
In the European Union, the gallon was removed from the list of legally defined primary units of measure in 1994. As a result, Ireland and the United Kingdom passed legislation to replace the gallon with the litre as a primary unit of measure in trade and public business, effective from 31 December 1993, and 30 September 1995, respectively.
It is worth noting that some countries, such as the United States, some Latin American countries, and Caribbean countries, still use the US gallon, which is defined as 231 cubic inches or 3.785411784 litres. However, El Salvador ceased using the US gallon in June 2021, becoming the latest country to switch to litres.
The transition from gallons to litres in Australia and other countries has been a gradual process, with some countries making the switch earlier than others. The adoption of the litre as a primary unit of measure in trade and public business has been a driving force in many countries' transitions.
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The quart, pint, cup, and gill
Australia adopted the metric system in 1976, replacing the imperial gallon with the litre as the primary unit of measurement.
Starting with the largest, the quart is a unit of volume equal to one-fourth of a gallon. Both the imperial and US gallons are divided into four quarts, with each quart containing two pints. A quart is equal to approximately 0.946 litres in the imperial system and about 0.94 litres in the US system.
The pint is the next unit of volume down from the quart. As mentioned, there are two pints in a quart, and there are also two pints in a gallon. In the imperial system, a pint is equivalent to about 0.568 litres, while in the US system, it is equivalent to approximately 0.473 litres.
The cup is a smaller unit of volume, with two cups making up a pint in both the imperial and US systems. This means that there are eight cups in a gallon and sixteen cups in four quarts. A cup in the imperial system contains about 0.284 litres, while in the US system, it holds approximately 0.236 litres.
Finally, the gill is the smallest unit of volume among the four. There are two gills in a cup, four gills in a pint, and thirty-two gills in a gallon. The gill is equivalent to about 0.142 litres in the imperial system and roughly 0.118 litres in the US system. The gill has been referenced in various songs and TV shows, including the traditional English folk song "Byker Hill" and the animated series "Archer."
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