Give an experiment to demonstrate that matter has mass?
Matter is anything that has mass and occupies space.
In order to understand that matter has mass, let's do an experiment.
step -1
Take two balloons, fill the air in one of the balloons while leaving the other balloon without air
step-2
Take a balance and find out the weight of the two balloons.
You can see that air filled with the balloon has a higher weight than the other balloon without air, which means air has mass.
we know that air is matter hence matter has mass, proved.