How much salt would I need to float in my bath?

18th November 2010

Asked by: RICHARD O’NEILL, GLASGOW

As Archimedes showed over 2200 years ago, the trick lies in boosting the density of the bathwater until it exceeds that of your body. The easiest way to do that is to add salt to the water. But it requires a lot of the stuff: around 30kg in a standard bath-tub.

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