Problem No: $5$ A salesman for The Fabulous Co$.$ offered our surgical team a novel type of a surgical tool that he claims to cut painlessly. It works by blowing a very cold air onto the tissue to be cut. Tissue freezes, feeling disappears, and there is no need for anesthetics. "Fabulous!!"

He says that the heart of the device is a Hilsch tube, a device that splits a stream of high$-$pressure air