Matter and its forms

States of Matter Matter primarily exists in three fundamental physical states based on the arrangement and movement of its particles: Solids: Particles in a solid are tightly packed together in a fixed, rigid arrangement with strong forces of attraction between them. As a result, solids have a definite shape and a definite volume (e.g., ice, iron, wood). Liquids: Particles in a liquid are close together but free to slide past one another due to weaker intermolecular forces. Therefore, liquids have a definite volume but no fixed shape, taking the shape of the container they are placed in (e.g., water, milk, oil). Gases: Particles in a gas are very far apart with negligible attraction between them and move rapidly in all directions. Consequently, gases have neither a definite shape nor a definite volume (e.g., oxygen, carbon dioxide, steam). Interconversion of States Matter can change from one state to another by changing temperature or pressure. For example, heating solid ice melts it into liquid water, and further heating turns water into gaseous steam. These physical changes allow matter to adapt to different environmental conditions while maintaining its chemical identity.