Naked Science Forum
General Science => General Science => Topic started by: 22A on 26/01/2010 22:04:23
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Busses are larger and airier than private cars. Why therefore do the windows, particularly upstairs on busses, get covered in so much mist & condensation?
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Too many heavy breathers?
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Car better heated than upstairs on bus.
or
Lower volume per respiring/perspiring passenger on full upper deck than full car,
so more concentrated condensation i.e. higher humidity upstairs on bus than in car.
also
More frequent addition of wet footprints into bus than car, (even if the car was a taxi).
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Car better heated than upstairs on bus.
or
Lower volume per respiring/perspiring passenger on full upper deck than full car,
so more concentrated condensation i.e. higher humidity upstairs on bus than in car.
also
More frequent addition of wet footprints into bus than car, (even if the car was a taxi).
Very interesting theories RD, but it's fairly obvious that I identified the real problem.
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Its easier to demist a smaller area, for one thing, also you don't get a whole lot of people, possibly damp or wet from rain, jumping in your car every couple of minutes.
Of course, Geezer's explanation also holds water (pun intentional) (https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fbestsmileys.com%2Fflasher%2F1.gif&hash=d41ded07af137b258d1a61bbafc0eff1)
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I guess :) that when you breath out you let out warm vapour that rises due to it being warmed by your body heat and convection, and that it will fall out when it can't raise any more, as when it meets the roof, and other surfaces, I would expect the metal surfaces to have a moisture too even though we don't see them as easily? Also, when you breath out at a cold window condensation will transform your breaths into water as it meets the colder surface.