What volume of inert gas is needed to cause suffocation in an enclosed room of 18 cubic m? Show calculations.?

Answer 1

One answer is none. Suffocation simply requires the lack of oxygen. A vacuum in that room would achieve that.

Answer 2

In an enclosed room of 18 cubic meters, I believe that 18 cubic meters of inert gas would cause suffocation.

Calculations:
18 cubic meters = 18 cubic meters

Answer 3

If its an enclosed space you may not require inert gas at all to suffocate.