Balloon (aircraft)

Basic parts and how they work

Typical balloons share a few fundamental elements. The envelope is the large fabric bag that contains hot air or a lighter-than-air gas. The gondola or basket hangs beneath the envelope and carries people and equipment. Hot-air balloons include a burner to heat the air inside the envelope; gas balloons rely on helium or, historically, hydrogen. Ballast (usually sandbags) and vents or valves allow pilots to control altitude by releasing weight or gas, or by heating and cooling the lifting medium.

Types and notable variants

• Hot-air balloons: use burners to heat internal air; the most common form for leisure and sport.
• Gas balloons: use a low-density gas such as helium for continuous lift without a burner.
• Hybrid or Rozière balloons: combine a separate hot-air section and a gas cell to improve long-distance performance.
• Tethered balloons: anchored to the ground and used for short rides, advertising, or observation.

History and development

The first practical manned balloon flights were achieved in the late 18th century, opening a new era in human flight. Early experiments and public demonstrations rapidly showed balloons could carry people and instruments aloft, and they were used for scientific measurement and for military observation before powered flight became widespread. Over time materials, burners and safety practices improved, and modern balloons are used mainly for sport and tourism.

Operation, uses and distinctions

Pilots control a balloon largely by changing altitude: climbing or descending allows it to enter air layers moving in different directions, so cross-country travel depends on wind currents. Unlike an airship, which has engines and steering surfaces, a balloon has no propulsion and cannot directly steer; it drifts with the wind. This difference is often highlighted in comparisons between balloons and airships. Basic concepts of floating and lift are explained in many introductory sources on lighter-than-air flight; see, for example, general entries on aircraft and on how objects float.

Safety, regulation and modern significance

Balloon operations are regulated in most countries: pilots normally require certification, and flights follow rules for airspace and weather. Popular uses today include tourism rides over scenic areas, competitive ballooning events, scientific platforms for atmospheric sampling, and tethered promotional displays. Because balloons are quiet and provide a slow-moving platform, they remain valued for leisurely observation and experiential aviation despite their lack of directional control; pilots therefore plan flights carefully and rely on experience and meteorological information from sources such as wind charts and forecasts.