The end result, we realized several logisitics was necessary for the method of measuring liquids, the measuring cup. That's how we know, "how many quarts in a half-gallon" which is (1) and (2) pints = (1) whole gallon. For the usage of the average individual, the measuring of any form of liquid substance would be milk, water, kitchen oil, even engine oil. Wherein a scientist measures blood which we may be familiar with the normal withdrawal phrase, "pint of blood".
Now, let's break this down piece by piece:
|(4) Cups||=||(1) pint|
|(2) Pints||=||(1) Quart|
|(4) Quarts||=||(1) Gallon|
Overall, scientist have created a well formated structure for measuring that our society to live with, it has been embedded in our overall lives. Regardless if we are measuring things in the kitchen, labatory, or garage we have an idea of how much we need and how much we got. Another relevant canvas to check out at the bottom, click the picture for more related details on "how many quarts in a gallon":