Focus on the pronunciation of rpm
English definition of “rpm”
rpm (plural rpm or or rpms) UK (US r.p.m.)
› TRANSPORT abbreviation for revolutions per minute: used when stating the number of times part of a machine, engine, etc. goes around during a minute: at 600/7200/19,000, etc. rpm(s) We're trying to make engines that spin at more than 19,000 rpm. low/high rpm(s) The engine rpm remained relatively constant.