Carbon, in its most common form, is a solid at room temperature. This is the form we usually think of, like graphite in pencils and diamonds.

However, carbon can exist in other states:

* Liquid: Carbon melts at extremely high temperatures (around 3550°C or 6422°F). This occurs in specialized industrial processes.

* Gas: Carbon can be a gas in the form of carbon dioxide (CO2) or carbon monoxide (CO).

* Plasma: In extreme environments like stars, carbon can be ionized and exist as a plasma.

So, the answer depends on the specific conditions!