How many tonnes of air press down on every square metre of ground?

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The answer

10.3 tonnes

Just over 10 tonnes. Two elephants on every square metre.

How to get there

1. 1 m² × 10 m of water = 10 m³
2. 10 m³ of water weigh 10 tonnes
3. exactly: 1,013 hPa ≈ 10.3 t per m²

Source: Calculation with 1,013 hPa air pressure (Wikipedia)

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