matter is all around you. Matter is the substance that makes all things. Scientists define matter as thing that has weight and takes up space is it possible to prove that the things you see around you are made of matter? Actually such a proof just requires that you use a little common sense First, does each item have weight? Scientists use a scale to prove whether something has weight. A book, for example, might weigh one pound. A person might weigh 125 pounds. A sandwich might weigh only six ounces. If we put any of these items on a scale, we can find how much they weigh. Therefore, each item has a specific weight Second, let's prove that the things you see take up space For example, a book lying on a desk takes up space on the of the desk. A person sitting on a chair fills space in the chair. A sandwich im a plastic bag fills space in the bag Once you know that a book, a person, and a sandwich have weight and take up space, you can see that they all are made of matter, What about things that you can't see, such as air? Air is difficult to weigh on a scale. But you know that something that is heavy can move lighter things out of its way Air moves the leaves on the plants and the hairs on our head, so we can conclude that air has weight it's also true that if you blow air into a balloon, the air fills space