The particle theory of matter states that all matter is made up of tiny particles, specifically atoms and molecules, and that these particles have inherent characteristics. A major part of the theory is the belief that all particles in a single pure substance are the same and are different from particles of other substances.
The theory also maintains that there is space between all particles, that the particles are always moving, that they are attracted to one another and held together by strong forces and that the particles move faster as they gain energy or have a rise in temperature.
Since the term "matter" is used to describe anything that has substance, the particle theory of matter is essential to exploring how space is occupied in the world. It is often used to explain the properties of solids, gases and liquids. It also aids in understanding specific scientific phenomena, such as physical changes that occur with melting, sublimation, fusing, boiling, dissolving and evaporation. In addition, the theory explores physical properties like density, thickness, viscosity, luster, malleability and conductivity. It further gives credence to the supposition that all pure substances are also homogeneous, consisting of only one specific type of particle in the form of an atom, molecule or element.