Mass is…
In physics, mass is a property of a physical body which determines the strength of its mutual gravitational attraction to other bodies, its resistance to being accelerated by a force, and in the theory of relativity gives the mass–energy content of a system. The SI unit of mass is the kilogram (kg).
It depends what subject your using the word mass in.
amount of stuff
http://www.qrg.northwestern.edu/projects/vss/docs/space-environment/2-what-is-mass.html
A measure of how much matter is in an object. This gold bar is quite small but has a mass of 1 kilogram (about 2.2 pounds), so it contains a lot of matter. Mass is commonly measured by how much something weighs. But weight can change depending on where you are (such as on the moon) while the mass stays the same.
And ..::WELCOME TO OPENSTUDY:)::..
Join our real-time social learning platform and learn together with your friends!