Building a Liquid Sand Hot Tub (S03E03)
S03E03
By carefully controlling the amount of forced air, a hot tub full of sand can be made to look exactly like a bubbling pot of soup. But what’s the science behind this illusion? Mark explains the clever physics at work, revealing how air pressure and particle behavior combine to create the effect.
Show
Mark Rober's CrunchLabs
Episode
S03E03
Air Date
Mar 16, 2026
Season 3 Episodes
S03E01
Lava vs Laser Destruction Test
S03E02
Backyard Squirrel 2.0 - Bank Heist
S03E03
Building a Liquid Sand Hot Tub
S03E04
This Ball Is Impossible to Hit
S03E05
Vortex Cannon vs Drone
S03E06
Glitter Bomb 1.0 vs Porch Pirates
S03E07
Engineers vs Food Robots
S03E08
Mark Rober vs Ninja Kidz
S03E09
Engineers vs Custom Go Kart Racing