Question

what do u mean by mass

Answer 1

mass is the quantity of matter contained in a body 

Answer 2

mass is defined as the no or particles present in matter which is uneffected by gravity

its SI unit is Kilogram

its symbol is m

we measure elements , atoms in terms of mass and mass the one of the most  basic fundamental physical quantity

mass remains same everywhere but weight of an object differs at some places like poles and equators