Re: HID lights
You're right about the boiling point of water changing relative to elevation but with a closed system there isn't a pressure differential with a change in elevation (internal to the system) so it's not a factor.
What *is* a factor is the reduced atmosphere at higher elevations and the impact is causes by reduced thermal dissipation. Since the air is thinner at high altitudes, engines can't get rid of their heat so they tend to overheat unless their cooling systems are sized to account for the sparse atmosphere.
Couple that with the fact that volumetric efficiency falls off with low density air and you've got a recipe for disaster.
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