But solids are generally hard of high density and we can hardly move through them. These properties give us a an idea about the spacing and attraction between particles in solids liquids and gases. This Diagram Shows That As Energy Is Added To Matter In The Form Of Heat Solids Become Liquids And States Of Matter States Of Matter Worksheet Kinetic Theory The worksheet is designed to test the learners knowledge on the arrangement of particles in solids liquids and gases. . Of particles in a substance. Air is very soft of very low density and we can freely move through it. Solids contain particles that are tightly packed with very little space between particles. In a solid the particles pack together as tightly as possible in a neat and ordered arrangement. Liquid are close together with no regular arrangement. Solids have fixed shaped that are hard to break apart because individual particles do not have enough energy to esca