Question #c29e5

1 Answer
May 9, 2017

#"CO"_2# cannot be liquefied at 35 °C, however large the pressure may be,
because 35 °C is above the critical temperature of #"CO"_2#.


The critical temperature is the temperature above which a gas cannot be liquefied by pressure alone.

The critical temperature of #"CO"_2# is 31.10 °C.

We can see that, if the temperature is 35 °C, an increase in pressure will create only a supercritical fluid, a state in which the gas and liquid phases cannot be distinguished from each other.