Por que a distinção importa
Imperial gallon and cubic foot belong to measurement conventions that may look familiar but are not always equivalent across countries. Mendeleev.com therefore keeps the system name next to the abbreviation and calculates from defined conversion factors rather than rounded kitchen rules.
Exemplo
1 imp gal = 0.160543653236 ft³ · 10 imp gal = 1.60543653236 ft³.
0.160543653236 ft³