The most commonly used units of weight in the U.S. Customary System are ounce, pound and ton. Mass refers to the quantity of an object.
Weight refers to the force of gravity exerted on the object.
Weight U.S Customary System vs. Metric Volume is the capacity of a container, the number of cubic inches it takes to fill a space. Volume may refer to liquids or solids. A decimal system is based on the number 10. You multiply and divide by ten to change to a larger or smaller unit.