Mercury is employed in the barometer because its density is sufficiently high for a relative short column to be obtained. High density scales down the pressure head h to repesent same magnitude of pressure in a tube of smaller height. Even if the air is completely absent, a perfect vacuum at the top of the tube is never possible. The space would be occupied by the mercury vapour and the pressure would equal to the vapour pressure of mercury at its existing temperature. This almost vacuum condition above the mercury in the barometer is known as Torricellian vacuum.
The pressure at A equal to that at B Fig. Therefore, we can write. Pascal Pa is defined as. At what temperature water has maximum density? A solid weighs 50 gf in air and 44 gf in liquid of relative density 0. Find the density of the solid. Clouds float in the air, because of:.
More Fluids Questions Q1. Which of the following instruments is based on Archimedes principle? A fluid is flowing through a horizontal pipe. When pipe is constricted then-. Find the apparent weight of solid in brine. A piece of copper of density 8. Which property of an object determines whether the object will float or sink in the liquid? Suggested Test Series. Physics for Defence Examinations Mock Test. Army Soldier Technical Mock Test Suggested Exams.
More Physics Questions Q1. X-rays were discovered by:. When a body is immersed in a liquid the upward force experienced by it is known as :. Which among the following is a non-conservative force? The work done to move a unit charge from a point to another is called :. On which of the following scientific principles is an electric generator based?
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