There's a whole lot to be said for YouTube videos that are five to ten minutes long. I can show an entire five to ten minutes in class without committing a full bell. The video likely has enough information to be useful but not so much as to be rambling around and further on a topic than I need to it.
But YouTube's algorithm seems to be killing those five- to ten-minute videos in favor of either long videos (between thirty and forty-five minutes from what I can tell of the posting patterns of my favorite YouTubers) and shorts that are less than a minute and a half.
I'm not happy about that.
...but I am thrilled about the video that I'm posting today and that is clearly too long to be shown in class on a whim. Today's nearly thirty-minute long video is a brilliant exploration of phase transitions of glass.
It starts with Destin recapping what Prince Rupert's drops (PRD) are, something he's covered in way more depth, then goes on to let Cal from Orbix hot glass - also from that earlier PRD video - try to capture a shattering PRD inside a class prison - rather than the epoxy prison that Destin tried to use previously.
Then at about 7:00 the stress-strain curve shows up, and we start to see that glass isn't quite as simple as we'd been lead to believe previously.
And a graph of viscosity versus temperature blows it all away around 8:00 where we hear that glass is a second order (more info here and here) transition material.
...and I was hooked. Destin continues to produce some of the best science content on YouTube.
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