Festival
Hot air balloons float because the volume of the balloon is so large that the entire balloon, including the basket and the people is less dense than the surrounding air. 
5th Putrajaya International Hot Air Balloon Fiesta 2013 
Hot air balloons float because the volume of the balloon is so large that the entire balloon, including the basket and the people is less dense than the surrounding air.
5th Putrajaya International Hot Air Balloon Fiesta 2013
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