The Eiffel Tower is melted down and cast as a slab exactly over its footprint. How many centimetres thick is the slab?

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The answer

6 centimetres

Only about 6 centimetres. The tower is almost all air.

How to get there

1. 7,300 t of iron ÷ 7.9 t per m³ (density of iron) ≈ 930 m³
2. Base 125 m × 125 m = 15,625 m²
3. 930 m³ ÷ 15,625 m² ≈ 0.06 m = 6 cm

Source: Wikipedia: Eiffel Tower, 7,300 t of iron, 125 m base; density of iron 7.874 g/cm³ (Wikipedia: Iron)

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