* Gas: This is the most common form of carbon dioxide in the atmosphere. It's what we breathe out and what plants use for photosynthesis.
* Liquid: Carbon dioxide can exist as a liquid under high pressure, typically found in fire extinguishers and some industrial applications.
* Solid: This is the form we know as dry ice. It's a solid at room temperature and atmospheric pressure.
So, the state of carbon dioxide depends on the temperature and pressure conditions.
