Por que a distinção importa
US liquid gallon and Imperial quart 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 US gal = 3.33069673852 imp qt · 10 US gal = 33.3069673852 imp qt.
3.33069673852 imp qt