The universe is made up of matter and energy. Matter can be changed into energy. Matter has mass or weight. Matter has volume, or takes up space, length, height, and width. Matter has density, how close the atoms are packed together.
Density equals mass divided by volume.
B. Special a. Physical properties and changes 1. Crystalline solids-regular repeating pattern. Amorphous solids-solids that do not keep their shapes like rubber or wax. Some scientists say they are very slow moving liquids.