Constant Level Balloon

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Constant Level Balloon

A balloon designed to float at a constant-pressure level. Also called constant-pressure balloon. See skyhook balloon.
In one design for such a system, a pressure switch actuates a valve which controls the release of ballast so as to maintain flight above a selected pressure level until the supply of ballast is exhausted.
Another design is a simple nonextensible envelope capable of withstanding a differential of pressure, higher inside than out. It is inflated so that the smaller night-time pressure of the gas still fully extends the envelope. Such a superpressure balloon will keep essentially constant level until enough gas diffuses out of it to allow diurnal changes in volumes.


This article is based on NASA's Dictionary of Technical Terms for Aerospace Use