Question

what does the upward arrow
making indicate?
1-hot air rises up
2-cool air rises up
3-hot air going down
4-cool air going down
​

Answer 1

$\color{blue}{ANSWER}$

Option (1) Hot air rise up ↑

Hot air rises because when you heat air (or any other gas for that matter), it expands.

Answer 2

Option (a) is your answer :)