Relative humidity in standard atmosphere?
I was asked this in my ground school session today and couldn't reply.
Through my A&P schooling and flight training thus far I'm not sure that I've ever known there to be a standard relative humidity. I guess a higher humidity would make for less dense air, so it would make a difference.
All I've ever known is temperature 59F (15C) and 29.92Hg.
Anyone know the answer?