Carbon freezes (or transitions to a solid phase) at extremely high pressures and low temperatures, depending on its form. In its most stable solid form, graphite, carbon freezes at around 3,600 Kelvin (3,327°C or 6,020°F) under normal atmospheric pressure. However, carbon can exist in other solid states, such as diamond, which forms under incredibly high pressures deep within the Earth. At standard atmospheric conditions, carbon doesn’t have a conventional freezing point because it sublimates directly from a solid to a gas at around 4,827°C (8,721°F). The exact freezing temperature depends heavily on the pressure and the carbon allotrope involved.
