Uncle Bob

Pilot Jim is talking about air conditioning on an airplane.

Oh, and air conditioning isn't about blowing cold air on a hot August afternoon. You see (you can take a nap now) we tap air for pressurization off the engines. We tap it after the turbines but before the combustion chamber. Big deal you say. Well, physics being what it is and gas laws being the way they are, we're tapping air that's either 350-ish (degrees F) or close to 800 F. That's just from compressing the air from ambient. There's not fire going on yet. Well, even with losses in the system, we'd be pouring 130-150 F air into the cabin if we didn't run it through a heat exchange systems first. Thus we condition the air. See, Bob's your uncle.

I thought he was your uncle.

I thought it was funny.