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...

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. :td::td::td:.

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/

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