Asked by: Richard Evans, Ashford
Just over five quadrillion tonnes. Air is surprisingly heavy. A cubic metre of air at sea level weighs about 1.3kg and all the oceans only weigh 270 times as much as the atmosphere. We tend to underestimate the mass of air because we spend all our lives surrounded by it, and it presses down on us from all directions equally.
Luis trained as a zoologist, but now works as a science and technology educator. In his spare time he builds 3D-printed robots, in the hope that he will be spared when the revolution inevitably comes.