Pour a whole cup of water on a diaper and not a single drop leaks out — even though it crinkles like paper in your hands. Real paper would be soaked and falling apart by now. So how does a diaper hold back every last drop? The secret hides under the outer cover . Beneath that papery surface lies a plastic film so thin you'd never guess it was there. Diaperman's Deep Dive Ep.27 Short breaks it down in 60 seconds. Five times thinner than a hair — one seamless wall The film under the cover is five times thinner than a human hair . Yet it leaves no gap at all for water to pass through. It is one seamless wall, with no opening for a drop to squeeze through. It looks like paper on the outside, but inside it's a plastic barrier. Paper and film start from opposite places Paper is a tangle of fibers, and it pulls water in through the gaps between them — that's why a paper cup eventually goes soggy. The film, on the other hand, is a single sheet with no gaps, so there is...
Even in pouring rain , the candy inside a pumpkin bucket stays bone dry — while a paper bag would have gone soggy in minutes. What makes this simple bucket so completely rain-proof? The secret is the material: plastic . No waterproof coating, no special trick. The answer is in the structure of the plastic itself. Diaperman's Deep Dive Ep.27 Short breaks it down in 60 seconds. Molecules packed so tight, water can't squeeze in Zoom in to the molecular level and plastic's molecules sit tightly packed against each other. There are simply no gaps for water to squeeze through. No matter how hard the rain falls, it can only run off the surface — it can never soak in. That's a completely different starting point from paper, whose loose fibers are full of empty spaces. This bucket is family with a diaper's outer layer Here's the fun part: a pumpkin bucket and a diaper's outer layer are the same kind of plastic — family. Both exist to keep water from getting ...