User talk:Sushmitha B K/sandbox

WHY DO HOT AIR BALLOONS RISES UP ?? ''Have you ever thought of flying like a bird and do diving in the sky? But humans can’t grow wings right. In this advanced world of technology people have found out various ways of flying like a bird in the huge sky. Of course humans have created aeroplanes ….. But to experience the real sight like a bird it is so much easy to ride in a hot air balloon. Why do these balloons rise up??? It is based upon simple scientific principle-” HOT AIR RISES UP” You can experience this if you are living in a multi storeyed building, you will feel better in ground floor as you go up the upper floor the house will be filled with hot air. Even when you climb the attic of your house you experience the hot air. The balloon part of the hot air balloon is called envelope. Burner will be positioned below the balloon. It uses propane fuel to send the balloon upwards. When the burner is lit a flame is produced which heats up the air within envelope, balloon expands and lifts up by taking the basket attached to it which carries the basket. As long as the air stays heated, it pushes balloon up and keeps afloat. The more air inside the balloon greater is the buoyancy. After completing the ride the pilot open a valve which allows some amount of hot air to get it released causing the balloon to come back to the earth. Albuquerque International Balloon festival is the world’s largest and in India also Pushkar balloon festival occurs every year.We can see a simple principle of science involved in this kind of each aspect of life.