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The air in flask Y gains heat from the hotter 90C water in Basin B and expands. The air then moves into the glass tube and pushes the drop of red ink towards Flask X. 

 

Option 1 : Gains most heat from B, expands the most, pushes red ink furthest to X. 

Option 2: Similar to Option 1, but gains less heat since water is only 30C, so it moves less towards X.

Option 3: Both sides same temp, expansion is the same, ink drop will not move.

Option 4: Same mechanism as Option 1, but in opposite direction

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 Hi Zappy, 

I understand that when the flask Y is in hotter water, it will expand. But how does it push the ink towards flask X?

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The AIR in flask Y will expand more than the AIR in the other flask. Not the flask per se. So if the AIR expands, the volume of air increases, therefore the air has to go somewhere… up into the tube and thus pushing the ink droplet.

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