內燃機 (Lōe-jiân-ki) (內燃機) 是 (sī)熱機 (jia̍t-ki)的 (ê)一 (chi̍t)種 (chióng),負責 (hū-chek)共 (kā)燃料 (jiân-liāu)的化學能 (hòa-ha̍k-lêng)轉變 (choán-piàn)做 (chò)力學能 (le̍k-ha̍k-lêng)。內燃機一般 (it-poaⁿ)的運作 (ūn-chok)方式 (hong-sek)是共燃料和 (hām)空氣 (khong-khì)透濫 (thàu-lām)燃燒 (jiân-sio),產生 (sán-seng)熱能 (jia̍t-lêng),氣體 (khì-thé)受熱 (siū-jia̍t)膨脹 (phòng-tiòng),通過 (thong-kòe)機械 (ki-hāi)裝置 (chong-tì)轉化 (choán-hòa)做力學能,然後 (jiân-āu)對外 (tùi-goā)作功 (chok-kong)。內燃機有 (ū)非常 (hui-siông)講法 (kóng-hoat)的應用 (èng-iōng),自動車 (chū-tōng-chhia),前 (chûn),飛行機 (hui-hêng-ki),火箭 (hóe-chìⁿ)的緣 (iân)jín攏總 (lóng-chóng)是內燃機; 其中 (kî-tiong),上蓋 (siōng-kài)捷看 (chia̍p-khoàⁿ)的內燃機就 (chiū)是自動車的汽油 (khì-iû)緣jín佮 (kap)柴油 (chhâ-iû)緣jín。