HackerTube / Video
Liquid Sand Hot Tub- Fluidized air bed
Mark Rober
Mark Rober builds a hot tub filled with sand fluidized by air blown from below, so that the sand behaves like a liquid. He explains how fluidized beds work and shows people swimming in them.
HN mentions it as the famous, kid-delighting demo of fluidization, especially in sand battery and industrial process threads.
5 Hacker News mentions · 2018–2025