Letter: Letters: Floating on air

Published 9 April 1994

From IAN TRESMAN

Q: Water vapour is 800 times more dense than air, and ozone nearly twice
as dense. Yet water vapour floats in cloud layers, and oxone in a layer
up to 50 kilometres high. How?

Ian Tresman Borehamwood, Hertfordshire

Issue no. 1920 published 9 April 1994

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