On Thu, Nov 25, 2004 at 02:35:26AM +0000, Alberto Monteiro wrote: > > Also, I'm not familiar with the geography of Rio. I know it has > > beaches, but are there also some high areas (I remember some > > pictures, but not sure if it was Rio)? > > Yes, two tourist points at 300 and 500 meters (sort of).
It wouldn't be unusual to see pressures of 725mmHg at 500m above sea-level. So you could certainly argue for 75cm answer as plausible at certain places in Rio. But I guess the 77cm one is hard to justify -- it would have to be a really high pressure wave from some unusual weather condition (unless the stay-at-home decided to go swimming with the barometer...). > Yes - and unfortunately now that I have the table I can see that Rio > pressure varies within 5 mmHg around the 760. Curiously, it's bigger > in Winter than in Summer [I would imagine the reverse]. Air density also depends on how much water vapor is present. If there is more water vapor in the summer, the density and pressure could be less (H20 is lighter than N2, CO2, O2, etc.). -- Erik Reuter http://www.erikreuter.net/ _______________________________________________ http://www.mccmedia.com/mailman/listinfo/brin-l
