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 matter within a body. Mass is measured in kilograms and grams (metric) and slugs (English). Weight is the force of gravitational attraction on a body as observed on the rotating Earth or similar situation. Weight on Earth and weight on the Moon of the same object, is different.