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A balloon is a flexible bag normally filled with gas. Some balloons are purely decorative, others are used for specific purposes. Early balloons were made of dried animal bladders. Modern balloons can be made from materials such as rubber, latex, chloroprene or a nylon fabric. The modern balloon was invented by Michael Faraday in the 1800's, but mass production didn't occur until the 1930's.
Usage of balloons
Balloons as flying machinesLarge balloons filled with hot air or buoyant gas have been used as flying machines since the 18th century. See Balloon (aircraft) and Hot air balloon 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. Examples:
Balloons as decoration or entertainmentParty balloonsParty balloons are mostly made of natural latex tapped from rubber trees and can be filled with air, helium, water, or any other suitable liquid or gas. The rubber makes the volume adjustable. Filling with air is done with the mouth, with a manual or electric inflator or a source of compressed air. When rubber balloons are filled with helium so that they float they can hold their lift for only a short time depending on the size of the balloon, the time can vary from 18 hours to several days. The enclosed helium molecules escape through small pores in the latex which are larger than the helium molecules. Balloons filled with air can hold their size and shape almost indefinitely. Even a perfect rubber membrane eventually loses the gas to the outside. The process by which a substance or solute migrates from a region of high concentration, through a barrier or membrane, to a region of lower concentration is called diffusion. The inside of balloons can be treated with a special gel (e.g. "Hi Float" brand) which coats the inside of the balloon to reduce the helium leakage, thus increasing float time. Latex rubber balloons are completely biodegradable. Metallized nylon animal-shaped baloonsBeginning in the late 1970s, some more expensive (and longer-lasting) foil balloons have been made of thin, unstretchable, impermeable metallized plastic films. These balloons have attractive shiny reflective surfaces and are often printed with colour pictures and patterns. The most important attributes of metallized nylon for balloons are its light weight, increasing buoyancy and its ability to keep the helium gas from escaping for several weeks. However, there has been some environmental concern, since the metallized nylon does not biodegrade or shred as a rubber balloon does, and a helium balloon released into the atmosphere can travel a long way before finally bursting or deflating. Release of these types of balloons into the atmosphere is considered harmful to the environment. This type of balloon can also conduct electricity on its surface and released foil balloons can become entangled in powerlines and cause power outages. For this reason, it is illegal in some states to release foil balloons, even accidentally. In New Jersey and California it is illegal to sell an inflated foil balloon without a weight attached to it to prevent its accidental release. Balloon artists are entertainers who twist and tie inflated tubular balloons into sculptures (see also balloon animal). The balloons used for balloon sculpture are made of extra-stretchy rubber so that they can be twisted and tied without bursting. 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. A pump is usually used to inflate these balloons. Decorators may use hundreds of helium balloons to create balloon sculptures. Usually the round shape of the balloon restricts these to simple arches or walls, but on occasion more ambitious "sculptures" have been attempted with great success. The balloon decorating industry offers everything from simple balloon columns to stunning, very large and detailed sculptures. Water balloons are thin, small rubber balloons intended to be easily broken. They are usually used by children, who throw them at each other, trying to get each other wet - see practical joke. Balloons in medicineAngioplasty is a surgical procedure in which very small balloons are inserted into blocked or partially blocked blood vessels near the heart. Once in place, the balloon can be inflated to clear or compress arterial plaque, and to stretch the walls of the vein. A small stent can be inserted in its place to keep the vessel open after the balloon's removal. See myocardial infarction. 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. RecordsMaximum flight heightsManned Balloon The altitude record for manned balloons is 34668 metres. It was made by Malcolm D. Ross and Victor E. Prather over the Gulf of Mexico in 1961.
The altitude record for unmanned balloons is (1991 edition of Guinness Book) 51.8 kilometres. The vehicle was a Winzen-Balloon with a volume of 1.35 million cubic metres, which was launched in October 1972 in Chico, California, USA. This is the greatest altitude ever reached by a flying object requiring the surrounding air. Higher altitudes can only be reached by ballistic vehicles such as rockets, rocket planes or projectiles. Balloon tankSee Atlas (rocket). Usage of Balloons on other planetsIn 1984 the Russian space probe Vega released two aerobots into the atmosphere of Venus, from which signals were received for two days. Balloons in movies
See also
External linksWikimedia Commons has media related to: Balloons
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