Malted
Humdinger
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I thought the pressure was lower and the oxygen the same - thought the cabin pressure was about 5000m.
EDIT: 2000m
I didn't think the cargo hold would be that long, even an A380 wouldn't be that long! Didn't think they injected O2 into the cargo hold either, I thought O2 levels were lower at higher altitude. Maybe they pressurise the cargo hold too?
The percentage of 02 at higher altitude is the same but the pressure is lower, lower air pressure means there is less oxygen by volume. I am not sure how much they pressurise the cargo hold but my ears have difficulty in the cabin. Apparently at 2000m there is 80% of the 02 available at sea level (if at 2000m air pressure). http://www.altitude.org/air_pressure.php So if pressurised to the same level as that at sea level then O2 levels should be the same (about 21%).
Isn't temp lower at altitude? Like 2oC drop per approx 304.8 metres? So 2000m in altitude would be about 13oC cooler than ambient temp at sea level? I suppose cargo holds are insulated to some degree but poochy would probably be chilled. If the baggage handlers weren't so likely to break or steal your beer then it may be at perfect drinking temps after the flight, if left in the cargo hold.