Mani Slideshow: Manivannan’s trip from Ariyalūr (near Kumbakonam, Tamil Nadu, India) to 2 cities Munnar and Turaiyūr (near Tiruchirappalli) was created by TripAdvisor. See another India slideshow. Create your own stunning free slideshow from your travel photos.

சனி, 21 மே, 2011


  • Air is a mixture of gases.It contains mainly nitrogen and oxygen.
  • The Troposphere is the atmospheric layer closest to the surface of the earth.It contains the largest percentage of the total mass of the atmosphere.
  • The stratosphere is the second major layer of air in the atmosphere.Ozone is formed in stratosphere.
  • This layer of calm and clear air is preferred for high speed jet flights because of the absence of air pockets.
  • Above stratosphere is Mesosphere, it extends from 50 to 80 km.
  • Above mesosphere lies the Ionosphere, which has electrically conducting layers that help in radio communication.
  • The Thermosphere is located above the mesosphere .
  • The atmospheric pressure is measured by an instrument called a Barometer.
  • SI unit of pressure is Pascal. since pascal is a very small unit of pressure, we normally express pressure in kilopascal (kPa)

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