(a) A U-tube manometer containing mercury was used to find the negative pressure in the pipe, containing water. The right limb was open to the atmosphere. Find the vacuum pressure in the pipe, if the difference of mercury level in the two limbs was 70 mm and height of water in the left limb from the centre of the pipe was found to be 35 mm below.
Explanation
To find the vacuum pressure in the pipe, we need to calculate the pressure head due to the mercury column and the water column. We can then use the pressure head to calculate the vacuum pressure.
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