hot-air-balloon

Japanese: hot-air-balloon(英語表記)hotairballoon
hot-air-balloon

…They are also called balloons because they are light and can be carried freely by the wind. There are gas balloons, which float by filling a bag (called an air bladder) with hydrogen gas or helium gas, which is lighter than air, and hot air balloons, which float by heating the air in the air bladder with a burner or other device. When an object is in a fluid (air in the case of a balloon), the object experiences a buoyant force equal to the weight of the fluid of the same volume as the object. …

*Some of the terminology that mentions "hot-air-balloon" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…軽気球ということもあり,また風に自由に流されることから風船とも呼ばれる。空気より軽い水素ガスやヘリウムガスを袋(気囊という)に詰めて浮かぶガス気球と,気囊内の空気をバーナーなどで熱して軽くして浮かぶ熱気球hot‐air‐balloonがある。流体中(気球の場合は空気)では,物体はその体積と同体積の流体の重さに等しい浮力を受ける。…

※「hot-air-balloon」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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