I once had a conversation with some math grad students. I mentioned there was a fluid dynamic problem that I was wondering about. I noticed that when a tap is pour out a thin stream of water and I obstruct it near the top, it makes a stable wavy pattern above where it is blocked. They weren’t familiar with this phenomenon, so I said I’ll show them. I went to the kitchen and turned on the tap with my finger on it. Someone said, (paraphrased,) “Oh, I thought you meant show a video.”
I once had a conversation with some math grad students. I mentioned there was a fluid dynamic problem that I was wondering about. I noticed that when a tap is pour out a thin stream of water and I obstruct it near the top, it makes a stable wavy pattern above where it is blocked. They weren’t familiar with this phenomenon, so I said I’ll show them. I went to the kitchen and turned on the tap with my finger on it. Someone said, (paraphrased,) “Oh, I thought you meant show a video.”
Picture taken today
I still don’t know the answer, I’d be delighted if anyone reading this linked to an explanation.