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THE AIRY WORLD

     


     We know our earth is enveloped by gas atmosphere.  The atmosphere stick to the earth because of gravity.  The moon has weak gravity.  Hence no atmosphere on it.  As the earth rotates, the atmosphere also rotates along with it.  Suppose, you are lifted up in the atmosphere by a balloon, you will be dragged along with the atmosphere and the earth.  As the fish live in water atmosphere, we live in gas atmosphere.  Both cannot breath outside.
     Air has the bouyancy like water.  Hence an airplane can glide and float like a ship on the water.  Many times we can see gliding birds.
     Sunlight scattered by the atmosphere gives the illusion of blue sky.  No blue sky in the night.  Our atmosphere has 78% of nitrogen.
    We inhale oxygen and give out carbon-di-oxide. The plants use carbon-di-oxide for photosynthesis and release oxygen.  This cycle keeps the Eco-system going.  The lungs of a city are parks.
     When the air molecules strike a surface, pressure arises.  That is what you feel when you press a balloon.  The atmospheric pressure is the important indicator of weather.  The air pressure pushes the juice in your straw as you suck. That is why you are able to drink it.
     We are able to converse with each other only because of the atmosphere.  The sound wave travel as the pressure wave in the air.  Artificial atmosphere is created in the space station and in the rockets.
     Everything burns due to oxygen in the atmosphere.  For example stove, petrol engine, candle.  Hence, energy is created out of atmosphere.
     In summer, we want to cool our bodies.  Hence we blow out the air using fan.  We want to keep warm in winter.  So, we do not want to loose warmed up air.  That is why we wear sweaters, fur clothes and thermal wears.
     When the air plane moves swiftly on the run way, air blows fast over it.  Consequently the pressure decreases over the plane.  Now there is a more pressure under the wings which lifts up the palace like plane.   On the moon, no atmosphere.  Hence take off can be done only by firing rocket engines.
     We may live wide apart, but we breath in the same atmosphere.   

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