auuuu Index
Ballooning INTRODUCTION
Early Balloons
Military Use of Balloons
Scientific Use of Balloons
Ballooning as a Sport
Ballooning Records
Long-distance records
Zero-pressure balloons
Superpressure Balloons
Uses of Scientific Balloons

Superpressure Balloons

The superpressure balloon is a rigid, nonstretchable balloon that is sealed with a plastic film to prevent the release of gas. It is also used to take horizontal measurements. By the time the balloon reaches its constant-altitude level, the gas in its envelope has become pressurized. Variations in the air pressure caused by the heat of the Sun produce changes in the internal gas pressure, but the volume of the balloon remains fixed. So long as the balloon remains under pressure, therefore, it continues to float at its predetermined constant-altitude level. Plastic films strong enough to withstand the high pressures within the balloon became available for use in about 1960. Flights of several months duration are possible with superpressure balloons.


Hot air ballooning

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