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Solids, Liquids & Gases Lesson for Kids

Instructor: Josh Corbat

Josh has taught Earth Science and Physical Science at the High School level and holds a Master of Education degree from UNC-Chapel Hill.

You know that water, air, and metal are very different materials. What makes them so different? In this lesson, we will talk about solids, liquids, and gases and what makes all of the materials on Earth fall into one of these three types.

Matter Gets Messy

You walk into a room and notice three containers have been knocked over. One was filled with a solid block of wood, one was filled with water, and one was filled with air from a perfume bottle. The wood still looks okay, no problem there. The water is all over the floor, though. And you can smell the perfume everywhere! What happened here?

States of Matter

The three states of matter are based on how close together the atoms are in a material.
States of matter

Every material on Earth can be classified into one of three states of matter. Matter is anything that is made up of atoms, and the state an object is in depends on how close together its atoms are.

Atoms are the basic building blocks of all materials on Earth (and everywhere else). You can't see atoms because they are incredibly small. Even microscopes can't see atoms unless they are very high quality (and very expensive).

Let's take a look at the three main states of matter and how close their atoms are together.

Solids

Why didn't the wood block in our opening example make a mess like the water? In solids, the atoms are tightly packed together in a material. They are so close together that they do not move very much and will stay the same shape even if you put the solid somewhere else, like on a table.

You will know something is solid because it is generally hard and keeps its shape, even if it's in a container with a different shape, like a round ball in a square box, or falls out of its container to the floor.

Look around the room and find three items that are solid. Hint: You're probably sitting on one. Wood, metal, and cardboard are common solids.

This picture shows water in two states of matter. The iceberg is a solid, and the water it is floating in is a liquid.
Iceberg

Liquids

Grab a towel! When you spill a liquid, it goes all over the place. Liquids have atoms that are close together, but not as close together as in a solid. The atoms slide around each other, which makes liquids lose their shape if you change the container they are in. For example, if you pour a liquid from a cup onto a table, the liquid will no longer be shaped like the cup. It will now form a flat puddle on the table.

Can you find three liquids in the room that you are in? Water, juice, and honey are common liquids.

Although you can
Gas burning

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