Manab Adhikar Sangram Samiti (MASS), (Assamese মানৱ অধিকাৰ সংগ্ৰাম সমিতি), is a regional non-profit human rights NGO in Assam. It was founded in 1991 by Parag Kumar Das along with a group of intellectuals and journalists of Assam. The present chairman is Ajit Kumar Bhuyan and its headquarter is at Bamunimoidam, Guwahati.

In physics, mass (from Greek  "barley cake, lump (of dough)"), more specifically inertial mass, can be defined as a quantitative measure of an object's resistance to the change of its speed. In addition to this, gravitational mass can be described as a measure of magnitude of the gravitational force which is

1. exerted by an object (active gravitational mass), or
2. experienced by an object (passive gravitational force)

when interacting with a second object. The SI unit of mass is the kilogram (kg).