排気(はいき)

はいき
noun
exhaust; ventilation
technicaltransportation
1. exhaust; exhaust gas; ventilation
The process of expelling used air or gas, or the expelled gas itself. Most commonly refers to vehicle exhaust or building ventilation systems.
排気(はいき)ガスを減(へ)らす。
To reduce exhaust emissions.
トンネル内(ない)の排気(はいき)システムが故障(こしょう)した。
The ventilation system inside the tunnel broke down.
この車(くるま)の排気量(はいきりょう)は2000ccだ。
This car has an engine displacement of 2000cc.

Common compounds: 排気(はいき)ガス (exhaust gas/fumes), 排気量(はいきりょう) (engine displacement, measured in cc or liters), 排気口(はいきこう) (exhaust vent), 排気管(はいきかん) (exhaust pipe). The opposite is 吸気(きゅうき) (intake/inhalation). Not to be confused with the homophone 廃棄(はいき) (disposal/discarding). 排気量(はいきりょう) is an important specification when buying a car in Japan, as it affects road tax rates.

Related Words

Homophone: 廃棄(はいき) (disposal/discarding)
Related: 排出(はいしゅつ) (emission)
Compare: 送風(そうふう) (ventilation)
Compare: 吸気(きゅうき) (inhalation)
Compare: 排出(はいしゅつ)する (to emit)
general
Added 2026.3.23 21:08 · Revised 2026.9.2 13:01
18500/18980_haiki