Definition: Mass is the quantity of inertia possessed by an object or the proportion between force and acceleration referred to in Newton's Second Law of Motion.
This is not a very good operational definition of mass, of course. In most common instances, mass is determined by weighing the object and using the force of gravity to calculate the value automatically - which is why you can get on a scale and have read your mass.
The SI unit of mass is the kilogram (kg).
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