Which conversion involves multiplying by 2.54?

The conversion that involves multiplying by 2.54 is the conversion from inches to centimeters. This is based on the fact that 1 inch is exactly equal to 2.54 centimeters. Therefore, to convert a measurement in inches to centimeters, you multiply the number of inches by 2.54.

For example, if you have a length of 5 inches and you want to convert it to centimeters, you would calculate it as follows: 5 inches × 2.54 cm/inch = 12.7 cm. This relationship is crucial when dealing with measurements in different units, especially in fields like science and engineering where accuracy in conversions is essential.

The other choices do not involve this specific multiplication factor because they deal with different units of measurement (like fluid ounces and quarts) that require different conversion factors.