wˌɛɹ pˈiː ɪz pɹˈɛʃɚ ænd vˈiː ɪz vˈɑːljuːm, jˈuːzɪŋ ðə fˌʌndəmˈɛntəl θˌɜːmoʊdaɪnˈæmɪk ɹᵻlˈeɪʃən kəmbˈaɪnd fˈɜːst ænd sˈɛkənd θˌɜːmoʊdaɪnˈæmɪk lˈɔːz;
where P is pressure and V is volume, using the fundamental thermodynamic relation (combined first and second thermodynamic laws);