What is Gas balloon?
[[Image:US_Navy_081203-N-4774B-113_A_Marine_assigned_to_the_13th_Marine_Expeditionary_Unit_(13th_MEU)_releases_a_Combat_Sky_satellite_communication_balloon_from_the_deck_of_the_amphibious_assault_ship_USS_Boxer_(LHD_4).jpg|250px|thumb|right|A gas balloon]] A '''gas balloon''' is a kind of [[balloon (aircraft)|balloon]] that uses a gas of low [[density]] to fly using [[buoyancy]]. Gas balloons sometimes fly very high, very far, and for a very long time. A gas balloon is different from a [[hot air balloon]]. A hot air balloon uses a fire to lower the density of [[air]]. A gas balloon does not use fire. The most common use for gas balloons are to measure the atmosphere. These are called [[weather balloon]]s. Some gas balloons carry people. {{Transport-stub}} {{aircraft}} [[Category:Aircraft]]