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5 November, 10:33

How was it first discovered that hot air could rise?

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  1. 5 November, 14:00
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    The history of balloon flight dates to 1783, when two French brothers, Joseph and Etienne Montgolfier, discovered that filling a bag with hot air would cause it to rise. They demonstrated their principle at Annonay, France, on June 4, 1783, with an unmanned balloon made of linen and pape
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