DragonflyTV . Podcast - Hot Air Balloons | PBS KIDS GO!

Source : http://kids.pbs.org/dragonflytv/show/balloon.html...

We're fascinated by the grace and speed of colorful, gigantic hot air balloons. To learn more about these massive beauties, we went to the Snowmass Hot Air Balloon Festival in Colorado. We were wondering how something bigger than a house can lift off the ground. Our question: How does hot air lift things?