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States of Matter

Introduction to one of the four states of matter where particles are tightly packed and have a definite shape and volume.

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States of Matter

Read carefully and answer all questions.

Water, Water Everywhere

States of matter are different phases in which any given type of matter can exist. There are actually four well-known states of matter: solid, liquid, gas, and plasma. Plasma isn’t represented in the iceberg photo, but the other three states of matter are. The iceberg itself consists of water in the solid state, and the ocean consists of water in the liquid state.

Q: Where is water in the gaseous state in the above photo?

Q: Water is one of the few substances that commonly exist on Earth in more than one state. Many other substances typically exist only in the solid, liquid, or gaseous state. Can you think of examples of matter that usually exists in just one of these three states?

Phases Are Physical

A given kind of matter has the same chemical makeup and the same chemical properties regardless of its state. That’s because state of matter is a physical property. As a result, when matter changes state, it doesn’t become a different kind of substance. For example, water is still water whether it exists as ice, liquid water, or water vapor.

Properties of Solids, Liquids, and Gases

The most common states of matter on Earth are solids, liquids, and gases. How do these states of matter differ? Their properties are contrasted in the Figure below. You can also watch videos about these three states of matter at the following URLs.



Properties of Matter in Different States

Q: The Figure below shows that a liquid takes the shape of its container. How could you demonstrate this?

Q: How could you show that a gas spreads out to take the volume as well as the shape of its container?


  • States of matter are different phases in which any given type of matter can exist. There are four well-known states of matter—solid, liquid, gas, and plasma—but only the first three states are common on Earth.
  • State of matter is a physical property of matter. A given kind of matter has the same chemical makeup and the same chemical properties, regardless of state.
  • Solids have a fixed volume and a fixed shape. Liquids have a fixed volume but take the shape of their container. Gases take both the volume and the shape of their container.


  • state of matter: Different phase (solid, liquid, gas, and plasma) in which matter can exist without the chemical makeup of matter changing.


Play the states of matter game at the following URL to reveal the hidden picture.


Review Questions

  1. Define state of matter.

  2. List four states of matter. Which states of matter are most common on Earth?

  3. What type of property is state of matter? How could you demonstrate this?

  4. Make a table comparing and contrasting solids, liquids, and gases.

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