* Matter: Anything that takes up space and has weight. It's made up of atoms and molecules.

* Mass: A measure of the amount of matter in an object.

* Weight: The force of gravity acting on an object's mass.

Key Points:

* Constant: Mass is an intrinsic property of an object and doesn't change based on its location.

* Units: Mass is typically measured in kilograms (kg) or grams (g).

* Not the same as weight: Weight can vary depending on the gravitational pull. For example, you would weigh less on the Moon than on Earth, even though your mass remains the same.

Let me know if you have more questions about mass, weight, or matter!