Changing States of Matter

Water can either be a solid, a liquid or a gas. How does matter change state? Chemistry - Atoms And Bonding - Learning Points. Ice, liquid water and steam all consist of exactly the same molecules. Evaporation occurs when the temperature rises enough to change a liquid to a gas. Condensing occurs when a gas cools down below its boiling point to form a liquid. Freezing occurs when a liquid is cooled enough to form a solid. A Twig Curriculum Film. Delivering key learning points. Get straight to the facts in just three minutes – directly linked to core learning, Twig's curriculum films will fit neatly into your lesson plans.