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Grade - 8 (BLE) Physics Pressure

A liquid exerts the pressure of 5000 pascals at the bottom of the vessel. If the depth of the liquid is 2 m, find its density.

A liquid exerts the pressure of 5000 pascals at the bottom of the vessel. If the depth of the liquid is 2 m, find its density.

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Tribhuvan University > Institute of Science and Technology > B.Sc. (CSIT)

Solution

Given, pressure (P) = 5000 Pa,

depth (h) =  2 m,

density (d) = ?

Acceleration due to gravity (g) = 10 m/s2 

We know that,

p = h×d×g

Or, 5000 = 2×d×10

Or, \(d=\frac{5000}{20}\)

∴ d = 250 kg/m3 

Hence, the density of the liquid is 250 kg/m3 

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Things to Remember From Pressure

  • The force acting perpendicularly on per unit surface area is called pressure. Its SI unit is N/m2 or Pascal.
  • The pressure exerted by the atmosphere is called atmospheric pressure.
  • The normal atmospheric pressure i.e. atmospheric pressure at the sea level is 760 mm of Hg.
  • Air has weight and it can be easily be compressed.
  • Air occupies space.
  • Atmospheric pressure decreases with the increase in altitude.
  • The pressure exerted by the liquid is called the liquid pressure.
  • Liquid exerts pressure at the bottom of the vessel as well as on the sides of the vessel in which it is kept.
  • Liquid pressure increases with the increase in depth.
  • Liquid exerts pressure equally in all directions.
  • When the pressure is applied to an enclosed liquid, then it transmits pressure equally in all directions. This is called Pascal's law.
  • Liquid pressure increases with the increase in the density of the liquids.

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