Ever wonder what it would like to jump into a pool of magma? Chances are you’re not dense enough to actually sink into a pool of roiling magma.
This has to do with the fact that lava is more than three times as dense as water, and well over 100,000 times as viscous. Wired’s Eric Klemetti compares a human trying to dunk him- or herself in lava to a piece of styrofoam floating on a pool of motor oil. Sinking obviously becomes even less feasible, when the lava begins to cool and forms a crust. Submersion just isn’t going to happen.
Those slow-mo movie lava deaths simply do not happen.