How many cubic inches of liquid are contained in one imperial gallon?

To determine the volume of liquid contained in one imperial gallon, it’s important to recognize the standard measurement for this unit. An imperial gallon is defined as being equal to 4.54609 liters. When converting this volume into cubic inches, the result will be approximately 277.42 cubic inches.

The correct option indicates that one imperial gallon is roughly 277 cubic inches for practical purposes, often rounding to the nearest whole number. Therefore, while many of the other choices may seem reasonable, they do not accurately reflect the standard conversion from an imperial gallon to cubic inches. Understanding these conversions is essential in various fields, including millwright work, where precise measurements are critical for installing and maintaining equipment.