PH-1831

Pressure in liquids

Physics · Secondary 4 · Hard · Pressure in liquids

A round-bottomed flask is connected to a mercury manometer. The difference in mercury levels is

h = 18\,\text{mm}

, with the mercury higher on the side open to the atmosphere. Take atmospheric pressure as

1.01 \times 10^5\,\text{Pa}

and the density of mercury as

1.36 \times 10^4\,\text{kg/m}^3

.

Using

p = h\rho g

, calculate the pressure of the air in the flask in Pa.

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