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@Gyro Gearloose
Note for OP
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I followed the same process but how can length of tube change ??

,rotate

the height of the mercury from the ground only depends on pressure & not angle, so even when the tube is tilted the mercury will retain the same
h
from ground level
in order for that to hold true, the length of the gas column has to adjust accordingly at different angles
This is not barometric, rather a pellet of mercury.

The effective length (or vertical projection) of the pellet changes, hence the pressure inside changes and hence the volume changes too.
why dont we take component of g here
how does that change the length or the volume of tube tho
The difference in pressure in liquid is rhogvertical length and not the component of g
ohh so length of the mercury "pellet" is same but its effective length is diff
..
Pellet moves up and down the tube to change length of air column.
got it
+solved @SirLancelotDuLac
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