- 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)
MANIVANNANRAJA
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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
வியாழன், 19 மே, 2011
science
- The study of viruses is called Virology.
- The study of Bacteria is called Bacteriology.
- Virus was discovered by Ivanowsky, a Russian botanist in 1892.
- The study of Algae is called Phycology.
- The study of Fungi is called Mycology.
- Pathology is a science which deals with diseases of plants,animals and human being caused by Viruses,bacteria and fungi.
வியாழன், 12 மே, 2011
G.K
- Global Hunger Index 2010; India dropped two ranks to 67th among 84 developing countries in the International Food policy research institute annual Global hunger index for 2010
- Even sudan, Northkorea and pakistan rank higher than India
- Global Gender Gap Report; India has been ranked on poor front in the list report puts India at 112 rank out of 134 nations
- Nobel Prize 2010; Nobel prize in chemistry 2010, Ei-ichi Negishi,Akira suzuki from Japan and Richard F.Heck from USA. Their work on palladium-catalyzed cross coupling in organic synthesis
- Medicine; Robert G.Edwards was awarded the 2010 Nobel prize for the development of human in vitro fertilization (IVF) therapy
- Physics; Andre Geim and Konstantin Novoselov for their groundbreaking work on experiments with graphene- a new form of carbon
Space
- Mercury is very close to the sun
- Venus is better known as the Evening or the Morning star.It is also called the earth's twin because of its similar size, density and mass
- Venus has no moon
- Earth is the third planet in terms of distance from the sun
- Mars is also called Red planet
Space
- On a clear night you can see about 3000 stars with naked eye
- The sun is a star, it is nearer to the earth
- The star nearest to the earth after the sun is Alpha centuari, which is at a distance of about 4.3 light year
- The earth rotates from west to east
- Mercury has no atmosphere
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