Mass is a measure of the amount of matter in an object. It's a fundamental property and does not change regardless of the object's location. In simpler terms:
Definition: Mass tells you how much "stuff" is in an object. A small object has less mass than a big one.
Measurement: Mass is typically measured in units like grams (g) or kilograms (kg).
Constant: An object's mass remains the same everywhere in the universe. For example, a kilogram of feathers has the same mass as a kilogram of rocks.
Not Weight: Mass is different from weight. While mass stays the same, weight depends on the gravitational pull. Weight is the force of gravity acting on an object's mass.
Inertia: Mass also relates to inertia, the resistance of an object to changes in its state of motion. Objects with more mass are harder to accelerate or decelerate.
In summary, mass is a measure of how much matter is in an object, and it stays constant regardless of where the object is located.