About humidity level on planes
#1
Original Poster


Join Date: Dec 2007
Location: Virginia City Highlands
Programs: Nothing anymore after 20 years
Posts: 7,190
About humidity level on planes
On my last flight (NRT-SIN) I had a humidity monitor onboard. Well after an hour in flight it showed 17% of humidity.
Mind you, this is pretty much the same level as in the middle of desert. So if you want to drink water all the time and your throat feel dry, there is a reason for it...
Mind you, this is pretty much the same level as in the middle of desert. So if you want to drink water all the time and your throat feel dry, there is a reason for it...
#2
Join Date: Aug 2002
Location: SAN
Programs: UA/CO-1KPlat, MARRIOTT-LT PLAT
Posts: 420
Thanks for the low Humidity reading!
There seems to be a lot of confusion about normal temperatures 'feeling' cold, when the air conditioning removes more moisture from the air.
It becomes very uncomfortable breathing on those Japanese airlines with the elevated temperatures and lowered pressure.

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There seems to be a lot of confusion about normal temperatures 'feeling' cold, when the air conditioning removes more moisture from the air.
It becomes very uncomfortable breathing on those Japanese airlines with the elevated temperatures and lowered pressure.
#3
FlyerTalk Evangelist




Join Date: May 2002
Location: Pittsburgh
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What aircraft? Because air is extremely cold and dry at cruising altitudes, cabin humidity is typically lower than that - 12% or so. Aircraft systems do not "remove" moisture - there's simply none there. The 787 has systems to try to get humidity into the upper teens to provide more relief.
http://www.askthepilot.com/questiona...n-air-quality/
http://www.askthepilot.com/questiona...n-air-quality/
#4
FlyerTalk Evangelist


Join Date: Apr 2001
Location: MEL CHC
Posts: 22,918
True The difference between relative humidity and absolute humidity. Cold air at altitude has very low absolute humidiity. Heat the air to cabin temperature the absolute humidiity will hardly change, but is still a low RH

