What is the state of carbon at 1500 degrees?

At 1500 degrees Celsius, carbon exists primarily in the form of graphite, which is its stable allotrope under high temperatures and pressures. However, at such high temperatures, carbon can also undergo sublimation, transitioning directly from solid to gas. Additionally, in the presence of oxygen, carbon can react to form carbon dioxide (CO₂) or carbon monoxide (CO). The specific state can depend on the surrounding environment and pressure conditions.