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Grade - 8 (BLE) Physics Pressure

Find the density of an object if its mass is 8000 kg and volume is 1000 m^3. 

Find the density of an object if its mass is 8000 kg and volume is 1000 m3. 

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Solution

Mass (m) = 8000 kg,

Volume (v) = 1000 m3 ,

Density, \(d=\frac mv\),

Or, \(d=\frac{8000}{1000})

∴ d = 8 mg/m3 

Hence, the density of an object is 8 kg/m^3.

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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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