For a spontaneous process, the entropy of the universe must remain the same.
The block reached the floor of the reactor.
For a spontaneous process, the entropy of the universe must remain the same.
Red withdrew the control rods.
For a spontaneous process, the entropy of the universe must remain the same.
The fuel was nearing its melting point.
For a spontaneous process, the entropy of the universe must remain the same.
Ice crystals started nucleating on the block of iron; crystal tendrils reached up through the pool and enveloped the fuel rods.
For a spontaneous process, the entropy of the universe must remain the same.
Red felt the temperature in the room drop. The fuel was well beyond the point of meltdown. Bubbles were shooting up through the solid block of ice filling the reactor pool. Steam rose in columns, wrapping around imperfections in the walls and depositing vine-like structures of solid ice.
For a spontaneous process, the entropy of the universe must remain the same.