Naked Science Forum

Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: paul.fr on 30/05/2007 00:40:09

Title: Hydrogen powered cars
Post by: paul.fr on 30/05/2007 00:40:09

If the majority of carswere powered by hydrogen, their exhaust emissions would be water. Would this lead to wetter roads? and possibly more accidents due to wet road conditions?

Title: Hydrogen powered cars
Post by: another_someone on 30/05/2007 01:27:58

I doubt you would get liquid water on the roads, but you could get more mist and fog.  I would expect that you are likely to have the water leaving the exhaust at too high a temperature to condense into water immediately upon leaving the exhaust.

Title: Hydrogen powered cars
Post by: daveshorts on 31/05/2007 15:08:55

Yes you would need to burn an immense amount of hydrogen to compare to the amount of water put into the air on a warm day by evaporation.

Title: Hydrogen powered cars
Post by: lyner on 03/06/2007 00:21:00

Why are people so chuffed with hydrogen powered transport?
Hydrogen is not an 'energy resource'; you can't find it anywhere except chemically combined with something else ( as water, for instance).
You still have to make it using some other energy source. The only good thing about hydrogen (and it IS a good thing) is that it produces very low LOCAL pollution. Someone else, somewhere else, already produced the bad pollution..
There's nothing for it but to walk everywhere, folks.

Title: Hydrogen powered cars
Post by: _Stefan_ on 03/06/2007 01:01:50

There are cars that run on compressed air and don't 'burn' anything at all ;)