Area (square feet) = 600 square miles × 5,280 square feet/square mile = 3,160,000,000 square feet
Next, we need to assume a height at which the population can comfortably stand. Let's assume an average height of 5 feet.
Volume = Area (square feet) × Height (feet) Volume = 3,160,000,000 square feet × 5 feet Volume = 15,800,000,000 cubic feet
Now, we need to convert the volume from cubic feet to cubic miles. There are 1,476,333,333 cubic feet in a cubic mile, so:
Volume (cubic miles) = Volume (cubic feet) ÷ 1,476,333,333 Volume (cubic miles) = 15,800,000,000 ÷ 1,476,333,333 Volume (cubic miles) = 10.7 cubic miles
Therefore, to contain the entire world population, we would need a volume of approximately 10.7 cubic miles, assuming an average height of 5 feet and a density similar to that of a solid object.
Please note that this calculation is purely theoretical and doesn't take into account factors like personal space, comfort, and actual population density.