However, there seems to be some disagreement on temperature and pressure when on the ground. If I'm on the ground (say airfield elevation is 1000ft) and I set my altimeter for airfield elevation. An hour later, the temperature has increased by 25 degrees (I have not changed the altimeter setting) - will my altimeter read higher or lower than before?? My assumption was that it would read higher, temp increased, air pressure decreased, higher reading.
Did the PRESSURE change?
NO, then the altimeter reads the same as before.
YES, then the altimeter changed, which way did the PRESSURE go?
UP, then the altimeter now reads lower than before.
DOWN, then the altimeter reads higher than before. (high to low, look out below, your altimeter reading will send you lower)
Can the PRESSURE go UP when the TEMPERATURE goes UP?
Yes.
Can the PRESSURE go DOWN when the TEMPERATURE goes UP?
Yes.
PRESSURE is NOT related to TEMPERATURE exclusively.