Why is there no liquid carbon dioxide?

Answer 1

Liquid carbon dioxide cannot exist at pressures below 5.1 atmospheres. Below that pressure, solid carbon dioxide (dry ice) sublimates directly to a gaseous state, rather than melting to a liquid state. The average pressure at Earth sea level is 1 atmosphere, decreasing as altitude increases. So, in order to observe liquid carbon dioxide, you would have to artificially increase the pressure to over 5 times that of sea level air pressure.

Answer 2

Because CO2 does not liquefy. It goes straight from gas to solid and back again with no liquid phase at normal atmospheric pressures.

CO2 under high pressure will turn liquid, but you can't normally "see" it because it would then usually be inside an opaque metal tank.

Answer 3

Carbon dioxide exists in a gaseous state at standard atmospheric pressure and temperature. To liquefy carbon dioxide, it must be subjected to very low temperatures and high pressures, typically below -78.5 degrees Celsius and above 5.1 atmospheres. At these conditions, carbon dioxide can exist as a liquid.

Answer 4

There is Liquid CO2

It is stored at ambient conditions under moderate pressure

(critical temperature = 31 C; critical pressure = 73 atm).