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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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