So, I know it’s not an actual shock diamond. I couldn’t find the name of the phenomena or anything else through Google. My hypothesis is that the air is leaving the hose nozzle with enough force and velocity to compress the air ahead of the stream faster than it can be displaced, causing a high pressure spot that diffracts light differently and this being visible. ‘shock diamond’ is about 2mm diameter and appears acorn-like in shape, acorn cap facing the nozzle. Is there a name of this phenomena and if so could someone long me a photo or video showing some examples.
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It’s probably condensation: When the air exits the nozzle and decompresses, it rapidly cools down. This can cause the moisture in the air to concensate into tiny droplets that vaporize again as they mix with the surrounding air.
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