-78.5 °C (-109.3 °F).
In order for co2 to become a solid, or 'dry ice' as it's called, its temperature must be below -109.3 degrees F.
Carbon dioxide (CO2), which is a gas at room temperature, will become a liquid and then a solid as we cool it more and more. The solid form of this substance is commonly called dry ice. We also know it is one of the few substances that will not melt and become a liquid. Instead, it will sublime and change state directly into a gas from its solid form.
Any element can become a solid at a certain temperature so yes, it can become a solid.
The same as most substances, CO2 must be cooled and put under increased pressure to become a solid. At one atmosphere, CO2 must be cooled to a temperature of -78.5 degrees Celsius to solidify. At height pressures CO2 solidifies at higher temperatures, however solid CO2 never exists at a temperature above -56.4 degrees Celsius.
At 1728K.
(Explanation): If you look at the phase diagram for CO2, and you draw a lines where the temperature and pressure meet, you will see that the point will be inside the zone that is 'solid', so it is in the solid state.
It become a Solid
Water drops that fall when the temperature is below freezing and become solid are called snowflakes.
Solid CO2 is also known as 'dry ice'
When solid ice becomes liquid, the temperature goes higher.
Dry ice is solid carbon dioxide (CO2). Dry ice is obtained from CO2 at a temperature under -80 oC.
Freezing and melting points are synonyms: at this temperature a solid become a liquid or a liquid become a solid.