States of matter: What is a gas? 

In this learning video we explore:
- Gas: What is it?
- What makes a gas different to a solid or liquid?
- How do the atoms of gas behave?
- Oxygen, and why we need it so much in the world.
*The music does not belong to us and has been purchased online.
* We have used photos and videos that do not belong to us and have referenced them in the video.