The definition of inbound is something that moves inward. An example of inbound is the freeway that goes toward the city center. 1  traveling or going inward.  Basketball inbounds.
Mass is a measurement of how much matter is in an object. Mass is a combination of the total number of atoms, the density of the atoms, and the type of atoms in an object. How to Measure Mass.
Mass: how much matter is in an object. We measure mass by weighing, but Weight and Mass are not really the same thing. These are the most common measurements: 1  Grams. 2  Kilograms. 3  Tonnes.