Gas

In science, a gas is one of the three states of matter, along with solids and liquids. Gases are all around us, and they can be found in the air we breathe, such as oxygen and carbon dioxide. Gases do not have a definite shape or volume, and they can expand to fill the space available to them. When heated, gases expand even more, and when cooled, they contract.

Characteristics of Gases:

• Do not have a definite shape or volume
• Can expand to fill the space available
• Can be compressed
• Can flow and move around

Examples of Gases:

Some common examples of gases include:

1. Oxygen (O₂)
2. Carbon Dioxide (CO₂)
3. Hydrogen (H₂)
4. Nitrogen (N₂)
5. Helium (He)

Study Guide

Here are some questions and activities to help you learn more about gases:

Questions:

1. What are the three states of matter?
2. What is a gas?
3. Can gases be compressed?
4. Give an example of a gas that is in the air we breathe.
5. What happens to gases when they are heated?

Activities:

1. Take a deep breath and ask the students to feel their chest expanding. Explain that this is because their lungs are filling with air, which is a mixture of gases including oxygen and nitrogen.
2. Set up an experiment to show the expansion and contraction of gases. Inflate a balloon and then place it in the freezer for a few minutes. Take it out and observe how it has contracted. Explain to the students that this is because the gas inside the balloon has cooled and contracted.
3. Watch a simple video or animation about the states of matter, emphasizing the characteristics and behavior of gases.

[Gas] Related Worksheets and Study Guides:

• The SkyScience • First Grade
• Describe and measure matterScience • First Grade