外 気(がいき)

がいき

noun

outside air, outdoor air

1. outside air, outdoor air, outdoor temperature

The air or atmospheric conditions outside a building or enclosed space. Used when discussing ventilation, temperature differences, or exposure to the outdoors.

外気(がいき)を取(と)り入(い)れる。

To let in outside air.

外気(がいき)温(おん)が氷点下(ひょうてんか)まで下(さ)がった。

The outdoor temperature dropped below freezing.

窓(まど)を開(あ)けて外気(がいき)に触(ふ)れると、部屋(へや)の空気(くうき)が一気(いっき)に入(い)れ替(か)わった。

When I opened the window and let in the outside air, the air in the room was completely refreshed.

外気(がいき) refers to the air outside a building or enclosed space. Most commonly used when discussing temperature or ventilation.

Forms

外(がい) (outside) + 気(き) (air, atmosphere).

Common collocations

外気(がいき)温(おん): outdoor temperature (a very common compound)
外気(がいき)を取(と)り入(い)れる: to take in outside air
外気(がいき)に触(ふ)れる: to be exposed to outside air
外気(がいき)に当(あ)たる: to get some fresh air
外気(がいき)導入(どうにゅう): intake of outside air (HVAC term)

Similar words

外気(がいき): outside air (technical/formal)
外(そと)の空気(くうき): outside air (everyday expression)
室内(しつない)の空気(くうき): indoor air

外気(がいき) appears frequently in weather forecasts (外気(がいき)温(おん)), health advice, and building/ventilation contexts.

general

Added 2026.2.20 18:51 · Revised 2026.9.2 13:01

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