Definition:Miscellaneous Volume Measure/Gallon
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Definition
The gallon is a unit of volume traditionally used for fluids, in the main liquids.
There are a number of different versions of the gallon, all of approximately the same order of magnitude.
Imperial Gallon
The (imperial) gallon is an imperial unit of volume.
It is defined as the volume of $10$ pounds of water under a specific set of conditions.
| \(\ds \) | \(\) | \(\ds 1\) | imperial gallon | |||||||||||
| \(\ds \) | \(=\) | \(\ds 2\) | pottles | |||||||||||
| \(\ds \) | \(=\) | \(\ds 4\) | quarts | |||||||||||
| \(\ds \) | \(=\) | \(\ds 277 \cdotp 4198\) | cubic inches | |||||||||||
| \(\ds \) | \(=\) | \(\ds 0 \cdotp 1605\) | cubic feet | |||||||||||
| \(\ds \) | \(=\) | \(\ds 4 \, 546 \cdotp 09\) | millilitres | |||||||||||
| \(\ds \) | \(=\) | \(\ds 4 \cdotp 54609\) | litres | |||||||||||
| \(\ds \) | \(=\) | \(\ds 4 \cdotp 54609 \times 10^{-3}\) | cubic metres |
US Gallon
The (US) gallon is a unit of volume used in the United States.
It is defined as $231$ cubic inches, which is exactly $3.78541 \, 1784$ litres.
| \(\ds \) | \(\) | \(\ds 1\) | gallon (US) | |||||||||||
| \(\ds \) | \(=\) | \(\ds 4\) | quarts (US) | |||||||||||
| \(\ds \) | \(=\) | \(\ds 231\) | cubic inches | |||||||||||
| \(\ds \) | \(=\) | \(\ds 3.78541 \, 1784 \times 10^{-3}\) | cubic metres | |||||||||||
| \(\ds \) | \(=\) | \(\ds 3.78541 \, 1784\) | litres | |||||||||||
| \(\ds \) | \(=\) | \(\ds 3785.41178 \, 4\) | millilitres | |||||||||||
| \(\ds \) | \(=\) | \(\ds 0.832 \, 674\) | imperial gallon |
Hence $6$ US gallons is approximately $5$ imperial gallons.