Comparison of masses of two substances using spring balance. Mass is the quantity of matter in a body.  More specifically, it is the measurement of the inertia or sluggishness that a body, in the absence of friction, exhibits in response to any effort made to start it, stop it or change in any way from its original state of motion.  Two items that have the same dimensions could have different masses, and two different sized objects could have similar mass.  Mass does not change, no matter if you are in space or on Earth.  Mass is a measure of the matter within a body.  Mass is measured in kilograms and grams (metric) and slugs (English).

Comparison of masses of two substances using spring balance

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