[88MPH]

So, I get the airspeed/ram air density thing no problem. What I was confused with was with less dense warm air (interpreted as the same as less dense upper air) indicated altitude would be LOWER while in less dense upper air, indicated altitude would be HIGHER. Both (warmth and height) make air less dense, but one lowers true alt while the other raises it.

So is there any downfall of always picturing the "egg" depiction of the atmosphere around the earth? If I imagine the atmosphere shallow at the poles (cold air) and thick at the equator (warm air), that theory works. Just wanna make sure there are no exceptions to figuring out density/true alt in regards to temp.