What is the equivalent of 21 USCS gallons in liters?

To convert USCS gallons to liters, it's important to use the conversion factor where 1 USCS gallon is approximately equal to 3.78541 liters.

When calculating the equivalent of 21 USCS gallons in liters, you would multiply the number of gallons by the conversion factor:

21 gallons × 3.78541 liters/gallon = 79.49461 liters.

When rounded to one decimal place, this equals approximately 79.5 liters. Thus, the option indicating 79.5 liters is correct, as it accurately reflects the calculation based on the standard conversion rate.

This conversion is essential in various fields, such as engineering and science, where understanding fluid volumes in different measurements is necessary for practical applications.