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Topic: Balloon (aircraft)

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Balloon

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	Balloon - Wikipedia, the free encyclopedia
		Such balloons, which lift a payload using buoyancy, should not be confused with balloons in space, launched with a rocket, which are simply large deployable structures.
		Balloons are sometimes used in form of a rockoon as carrier for rockets.
		Certain catheters have balloons at their tip to keep them from slipping out, for example the balloon of a Foley catheter is insufflated when the catheter is inserted into the urinary bladder and secures its position.
	en.wikipedia.org /wiki/Balloon (1125 words)

	Balloon - LearnThis.Info Enclyclopedia (Site not responding. Last check: 2007-11-05)
		Balloon artists are entertainers who twist and tie inflated tubular balloons into sculptures (see balloon animal).
		Since the pressure required to inflate a balloon is inversely proportional to the diameter of the balloon, these tiny tubular balloons are extremely hard to inflate initially.
		Angioplasty is a surgical procedure in which very small balloons made of a special material are inserted into blocked or partially blocked blood vessels near the heart.
	encyclopedia.learnthis.info /b/ba/balloon.html (674 words)

	balloon - Hutchinson encyclopedia article about balloon (Site not responding. Last check: 2007-11-05)
		Within a few years, balloon ascents were made and considerable distances travelled, but it was not until the late 19th century that weather conditions were understood sufficiently for balloonists to predict a destination.
		During the French Revolution balloons were used for observation; in World War I they were used by all sides as aerial observation posts for artillery spotters and as a form of air defence; in World War II they were used to defend London, England, against low-flying aircraft.
		Balloons are also used with space probes, such as the Soviet Vega probes that placed atmospheric balloons in Venus's atmosphere in 1985.
	encyclopedia.farlex.com /balloon (521 words)

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