Can anyone explain when to use the 2 following equations that are both for the same thing 1 inch cubed equals 2.54cm3 vs 1 inch cubed equals 16.3870640cm?

Answer 1

Very nice question. Here are your two equations: 1). 1 in3 = 2.54 cm3 2). 1 in3 = 16.387 cm3 The answer to your question is: Always use #2 and never use #1, because #1 is wrong. 1 inch = 2.54 centimeters (1 inch x 1 inch x 1 inch) = 1 inch3 (2.54 cm x 2.54 cm x 2.54 cm) = 16.387+ cm3, NOT 2.54 cm3