Question

a closed container has air at 20 degree Celsius. some air at 50 degree celsius is inserted into the centre of the container. In which direction will this air move- upwards, downwards or not at all???

Answer 1

It will move upwards. Cool air is dense and tends to fall in the presence of warmer air, while warmer air is less dense, and it is displaced up by the cooler air. 

I think no more explanations are needed to this, hope it helped.
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Answer 2

Answer: The answer is the air will move upwards

Explanation: This is because hot air always rises and 50 degree celsius is a high and hot temperature.

HOPE IT HELPS!!!!!!