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| | LHS GEMS, Discovering Density Literature |
 | | Basic facts about balloon dynamics are described: the use of hydrogen in some balloons, the effect of cold air outside on the temperature of the gas, and the altitude of the balloon. |
 | | In Chapter 2, balloon happenings include two brothers (weighing 75 and 58 pounds) who tie themselves to a balloon with a lifting pull of 60 pounds, and the flight of a 400-pound cupola which had been tied to balloons with a total of 900 pounds lifting pull. |
 | | He learns there is more to ballooning than just watching as he deals with air currents, power lines, and manipulating the gas burner. |
| www.lhsgems.org /DiscoveringDensConx.html (1123 words) |
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