pressure altitude

Japanese: pressure altitude(英語表記)pressurealtitude
pressure altitude

...that is, when flying in mountainous areas, it is the vertical distance from the aircraft to the mountain surface. In contrast, the altitude value obtained by applying the actual atmospheric pressure at a certain height to the standard atmospheric pressure and altitude relationship is called pressure altitude. Pressure altitude is a kind of assumed value, and the actual atmospheric conditions often differ from the standard atmospheric conditions. ...

*Some of the terminology that refers to "pressure altitude" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…すなわち,山岳地を飛行しているときは航空機から山岳表面までの垂直距離である。これに対し,標準大気の気圧と高度との関係を基準にし,ある高さの実際の大気圧をその基準にあてはめて得られる高度の値を気圧高度pressure altitudeという。気圧高度は一種の想定値であって,実際の大気の状態が標準大気と違うことがしばしばある。…

※「pressure altitude」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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