Hi, this is Trevor. As a science test, I have to design an experiment that shows that particles are too tiny to be seen and that matter is always conserved.
Materials: balloon, scale, sharp scissors
First, I weighed the balloon. It weighed 1 gram.
Then I blew up the balloon.
Now there are tiny particles in the balloon that you cannot see. That's why the balloon got bigger. The tiny particles are trapped inside.
I weighed all the parts of the balloon and it weighs 1 gram again. This proves that matter is conserved. Even though the balloon got separated into tiny balloon parts, it still weighs the same.