compression ratio
ratio of the volume of a combustion chamber from its largest capacity to its smallest capacity
en-GB/kəmˈpɹɛʃn ɹeɪʃiːəʊ/
en-US/kəmˈpɹɛʃən ˈɹeɪʃoʊ/
ratio of the volume of a combustion chamber from its largest capacity to its smallest capacity