Chōng-thài hong-thêng-sek

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bu̍t-lí-ha̍k kap jia̍t-le̍k-ha̍k lāi, chōng-thài hong-thêng-sek (狀態方程式; equation of state) sī the̍h-lâi biâu-su̍t jia̍t-le̍k-ha̍k hē-thóng ê jia̍t-le̍k-ha̍k hong-thêng-sek. Tī jia̍t-le̍k-ha̍k hē-thóng lāi ê kúi-nā-ê chōng-thài hâm-sò͘ ē-sái chioh-tioh chōng-thài hong-thêng-sek lâi piáu-ta̍t in chi-kan ê koan-hē. Tī jia̍t-le̍k-ha̍k léng-he̍k, siōng-chia̍p-khoàⁿ ê chōng-thài hong-thêng-sek chiū sī biâu-su̍t lí-sióng khì-thé hē-thóng ê lí-sióng khì-thé hong-thêng-sek.