Classify Solids, Liquids, and Gases

Classify Solids, Liquids, and Gases

What students learn

Students learn that matter can be a solid, a liquid, or a gas. Start with States of Matter: Sort Solid, Liquid, and Gas so students hear the three groups before naming examples.

Why it matters

Being able to sort matter helps students explain everyday objects and notice when something changes state. Use Solids: Keep Shape and Stay Together to focus on the most visible property first.

Learn the idea

A solid keeps its shape. A liquid flows and takes the shape of its container. A gas spreads out to fill space. Watch Liquids: Pour and Take the Container's Shape and Gases: Spread Out to Fill Space to compare the three states.

Try it

Sort a spoon, a cup of water, and the air in a balloon. Ask the student which ones keep shape, which ones pour, and which ones spread out. If they need another review, replay States of Matter: Sort Solid, Liquid, and Gas and name each example aloud.

Parent guide

Use household items and keep the comparison concrete. If a child says gas is empty space, remind them that air still takes up room. Ask them to say one property for each state before moving to the next object.