* Gas is a state of matter, characterized by particles that are far apart and move freely. Other states of matter include solids and liquids.
* Oxygen is a specific chemical element. It's a colorless, odorless gas that's essential for life on Earth.
Think of it this way:
* Gas is like a category, like "fruits".
* Oxygen is like a specific fruit within that category, like "apple".
While oxygen is a gas at room temperature, other gases exist, such as nitrogen, carbon dioxide, and helium.
