Too Long; Didn't Read
Engineers building and testing ventilators for COVID-19 need to have “test lungs” The term ‘test lung’ sometimes means a physical air-tight container with sophisticated instrumentation added. A test lung is a simulator of a real pair of lungs, but has standard and stable physical properties. It should oppose air from moving in or out too fast (just like real lungs which can’t fill or empty instantly) This is called resistance. It is almost impossible to understand how an emergency pandemic ventilator designed to help humans breathe without testing on test lungs.