States of Matter

• Solids to liquid is melting
• Liquid to solid is freezing
• liquid to gas is evaporation or boiling
• gas to liquid is condensation
• solid to gas is sublimation
• gas to solid is deposition
• Model – an equation, diagram or analogy representing something in an easy way showing key features
• When a substance is cooled the internal energy decreases. When a substance is heated the eternal energy increases. 
• Freezing doesn’t always mean cold, it means the freezing point