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ANSWERS: 1
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"What happens to helium filled balloons when you let them go ? FAQ About 95% will rise to 28,000 feet [8 534.4 meter] where the air is thin and very cold. The cold temperature causes the latex to become brittle. The thin air causes the balloons to expand and shatter into tiny pieces. The remaining 5% of released balloons, that do not rise high enough to shatter, drift with the wind currents for approximately 8 to 14 hours before coming down. They then revert to sap in as little as 4 to 8 weeks, depending upon environmental conditions." Source and further information: http://www.querycat.com/faq/6b6d2e4cae983adffe3a78c9368f7b85
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