aerostatics
American Heritage Dictionary:
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aer·o·stat·ics
(âr'ō-stăt'ĭks) 
n. (used with a sing. verb)
The science of gases in equilibrium and of the equilibrium of balloons or aircraft under changing atmospheric flight conditions.
n. (used with a sing. verb)
The science of gases in equilibrium and of the equilibrium of balloons or aircraft under changing atmospheric flight conditions.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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