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DescriptionUldbmain.jpg	English: Super Pressure Balloon Demonstration Requirements * 1-ton instrument to 100 kft * 100-day flight goal * Little or no day/night altitude variation. "Super pressure" means there is a higher pressure inside the balloon than outside. The super pressure balloons flown by the NASA program are essentially very large pressure vessels. At float altitudes the balloons have a very slight differential pressure compared to the ambiaent atmosphere. This positive pressure is on the order of around .0363 psi under the highest pressure loading. Most of the time it is much lower.
Date	30 July 2008
Source	NASA Wallops Flight Facility Code 820 Super Pressure, url=http://sites.wff.nasa.gov/code820/uldb.html
Author	NASA Official: David L. Pierce, Curator: Brandon Wright
Permission (Reusing this file)	Images from NASA usually are free of copyright.

Super-Pressure: Ultra Long Duration Balloon (ULDB) "Pumpkin".

	This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
	Warnings: Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[1] See also {{PD-Hubble}} and {{Cc-Hubble}}. The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."

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current	23:58, 2 December 2009		250 × 426 (31 KB)	Marshallsumter	{{Information \|Description={{en\|1=Super Pressure Balloon Demonstration Requirements * 1-ton instrument to 100 kft * 100-day flight goal * Little or no day/night altitude variation. "Super pressure" means there is a higher pressure inside the

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