air becomes liquid

At -78 deg C carbon dioxide CO2 gas become dry ice
At -182.95 deg C oxygen gas O2 become liquified
At -195.79 deg C nitrogen gas N2 become liquified
only noble gas like helium gas He2 still in gas form

I hope this can help your understanding. :)

2007-09-15 04:12:19 補充：
At -198 deg C about all component of air have become liquified or solidify except only noble gas like helium gas He2 still in gas form.

2007-09-18 17:37:25 補充：
sor ^^ mistype He as He2only noble gas like helium gas He still in gas formAt -198 deg C about all component of air have become liquified or solidify except only noble gas like helium gas He still in gas form.

air會變做liquid再變做solid