1.

Which of the following will rise the highest in the atmosphere?

A. Air at \[{{10}^{\text{o}}}C\]
B. Air at \[{{40}^{\text{o}}}C\]
C. Air at \[{{20}^{\text{o}}}C\]
D. Air at \[-{{5}^{\text{o}}}C\]
Answer» C. Air at \[{{20}^{\text{o}}}C\]


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