Big Air Balloons: What are they called and how do they work?
What is the big air balloons called? Airships, often called blimps, began to be built in the early 1900’s. They were inflated by hydrogen gas to keep them aloft. Airships are cigar shaped balloons, some of which have a rigid frame to maintain their shape. Read more on www.nationalballoonmuseum.com Big air balloons are a well-liked … Read more