<prompt> Yakha inguqulo eyinkimbinkimbi yalesi sigwebo Kwezinye iziphefumuleli, ama-valve anendlela eyodwa aqondisa igesi ngokusebenzisa iluphu .  <response>: Yiqiniso, inguqulo eyinkimbinkimbi yalesi sigwebo ithi Kwezinye izifutho zokuphefumula, ama - valve anendlela eyodwa aqondisa igesi ngokusebenzisa iluphu, kuyilapho kwezinye igesi ephefumulwayo nephephethwayo iya emuva naphambili ngeshubhu elilodwa: lokhu kubizwa ngokuthi uhlelo lwe - pendulum. 