Physical and Chemical Properties of Matter
The changes that take place in substances may be
Today we'll be going over the physical properties of the phases of matter. The phases of matter include: solid, liquid, and gas. The different types of matter can be differentiated by the composition and physical properties of each phase. Solids have closely bound molecules or atoms. This results in solids having both a specific shape and volume. Solids are often crystalline. A solid is rigid; the molecules may vibrate, but have very little molecular movement.The intramolecular forces are weaker in liquids. Each molecule is free to flow around the others, although the molecules are always in contact with one another. This causes liquids to have a specific volume, but its shape will vary based on the shape of its container. Due to very weak intramolecular forces, gases have neither a specific shape nor volume. Since there is a lot of space between the molecules in a gas, the molecules are not always in contact with one another, but they will collide. The volume of the gas will always expand out to fill its container, and its shape will also change based on the size and shape of its container.Matter can undergo physical changes that allow it to move between the phases. Physical changes do not alter the chemical composition of the substance. These changes are: Thank you for watching. For more information, please visit About.com.