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What is the density of the hot air in the balloon?
May 18th, 2012 | 
Author: A hot-air balloon plus cargo has a mass of 1940 kg and a volume of 11930 m^3. The balloon is floating at a constant height of 6.25m above the ground.
What is the density of the hot air in the balloon?
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What are the best hot air balloon festivals in north-east or mid-atlantic USA?
I would like to attend a hot air balloon festival. Something that is big and wouldn't be more than a couple of hours from Northern Virginia.
Any suggestions? Thanks so much, in advance.