is air matter?

Yes, air is matter. Matter is defined as anything that has volume (takes up space) and has mass (can be weighed). Air meets both of these criteria—it takes up space even though it is invisible, and it has mass, meaning it has weight. The molecules that make up air are constantly moving and have mass, which means air is a type of matter known as a gas. Additionally, air exerts pressure because of the mass and movement of its molecules. Thus, air is not empty space but a substance composed of molecules, making it matter.