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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク lighter than air ： ウィキペディア英語版 lighter than air Lighter than air refers to materials (usually gases) that are buoyant in air because they have average densities lower than that of air. Dry air has a density of about 1.29 g/L (gram per liter) at standard conditions for temperature and pressure (STP), and an average molecular mass of 28.97 g/mol.〔http://www.engineeringtoolbox.com/molecular-mass-air-d_679.html〕 Some of these gases are used as lifting gases in lighter-than-air aircraft, which include free balloons, moored balloons, and airships, to make the whole craft, on average, lighter than air. (Heavier-than-air aircraft include airplanes, gliders and helicopters). ==Usage as lifting gas== (詳細はウィキペディア（Wikipedia）』 ■ウィキペディアで「lighter than air」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.