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Grade - 8 (BLE) Physics Pressure

Why do deep-sea divers wear diving suits? Give reasons.

Deep sea divers wear diving suits. Why?

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As we know, liquid pressure, P = h×d×g

It shows that the liquid pressure increases with depth from its free surface. So, to withstand the enormous pressure applied by water, the deep sea divers wear special diving suits.

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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.

Topics from Physics

Physical Quantities 27 Electricity & Magnetism 48 Motion 8 Measurement 4 Electricity 166 Physical Optics 80 Waves 117 Force 51 Heat 137 Laws of Motion 1 Light 100 Pressure 139 Thermodynamics 1

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