HOT AIR BALLOON THINGS FLY FLIGHT GRAVITY AERODYNAMICS PROPULSION STRUCTURES MATERIALS FLIGHT DYNAMICS MULTIMEDIA EXHIBIT SMITHSONIAN NATIONAL AIR SPACE MUSEUM SEARCH HOT AIR BALLOONS INSIDE LESS DENSE HOT AIR COOL AIR CAUSES BALLOON RISE SIMPLY LIGHTER EQUAL VOLUME COLD BUOYANCY UPWARD FORCE BALLOONS BLIMPS USES BURNER HEAT THE BURNER LIQUID PROPANE THE FUEL CREATES FLAME UNDERNEATH THE BOTTOM OPENING ONCE BEGINS THE PILOT CONTROLS ALTITUDE VENT QUESTION AIR CHECK QUESTIONS AND ANSWERS TERMS OF USE PRIVACY CONTACT EXHIBITION DONATE