Question

what is the smallest room in the world

Answer 1

in the world the smallest room is 0.01 m *0.01*0.01 m

Answer 2

This doesn’t seem like a genuine question to me but rather a riddle.

Based on my understanding of the question and my knowledge, I would say the answer should be “mushroom”.

It should be the smallest room in the world as no room can be built smaller than a mushroom.