An ordinary squirt of canned air achieves supersonic speeds - engineer spots telltale shock diamonds
by from Tomshardware on (#6JQC2)
A precision engineering and machining YouTuber noticed telltale shock diamonds' in the stream emitted by his Staples-branded canned air and felt compelled to investigate further. Using a Schlieren imaging setup the YouTuber confirmed that the air duster was pushing out a supersonic flow of gas.