1.

A gas can be liquefied ______.

Answer»

A gas can be liquefied below its critical temperature.

For example, the critical temperature Tc​ for CO2​, O2​ and H2​ are 31.1°C, −118.8°C and −240 °C respectively. 

Thus, CO2​ gas cannot be liquefied above 31.1 °C however high the pressure may be applied.



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