states of matter lesson 2

• At room temperature, some matter are solids, some are liquids, and some are gases.
• A solid is matter that retains a fixed volume and shape.
• Particles in a solid are densely packed, meaning their density is high.
• The particles in a solid do not move around much, but they vibrate slightly.
• Liquids have a fixed volume and take the shape of the containers that hold it.
• Liquids contain particles that are close together but are not arranged in a regular pattern.
• Liquids have particles which vibrate and move around in small clumps/groups.
• Gases have no fixed shape or volume, they take the shape of the container that holds them and fill any container they occupy.
• Gases are particles that vibrate and move around freely at high speeds.
• Melting is the process of changing from a solid to a liquid.
• Freezing is the process of changing from a liquid to a solid.
• Boiling or evaporation is the process of changing from a liquid to a gas.
• Condensation is the process of changing from a gas to a liquid.
• Sublimation is the process of changing state from a solid to a gas or a gas to a solid without passing through the liquid phase.