SPEAKER_02 25:36–26:59
OK. So as it tightens, it compresses. And that's what squeezes the water out, right? So it's compressing the space. So the water has to go somewhere, can't stay in the towel, has to go outside the towel. OK. That's internal rotation. So as you twist the towel tighter and tighter, there's greater and greater compression. OK. And it's moving inward, right? Internal rotation. OK. It's becoming denser. There's less space inside of it, more space outside of it. It becomes dense, it goes down. So if I take something that is very, very dense and I put it in a pool of water, it sinks because it is more dense than the surrounding fluid, right? If I take something that is less dense, even if it weighs the same, if it takes something that's less dense and it has more surface area, it could potentially float. Right? Okay. So if I unring the towel, now I am allowing space to be created within the towel itself. And that is the expansive that is external rotation. Okay. So that's where sponge is another great example. So full sponge of water, I squeeze it out, right? I compress it. I squeeze the water out. The water has to go outside. But if I put the sponge underwater and I release it, it sucks it back in, right? So then it expands. Same rules.
collagen mechanicsinternal rotationexternal rotationtissue densitycompression and expansion