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1783年,法國物理學家查理做成的世界上第一個可載人氣球,體積為620立方米.若測得這個氣球在地面附近受到空氣的浮力為7800牛根據浮力的計算公式:F浮=G排,所以可得這個氣球所排開空氣的重力為7800牛,根據重力計算公式…
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