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 is a measure of the amount of matter an object contains. - 1  The amount of mass in an object does not change. - 2  Gravitational force can change (i.e. the moon), which can cause weight to change. - 3  This is the reason scientists prefer to measure matter by its mass rather than its weight.