Coke cans are in a cold fridge. The water in the air around the coke can turns to a liquid because at the surface of the coke can, the temperature and pressure in that area put H2O in its liquid state. It is about gradient to an extent, but one of the temps must be cold. When you are done welding on something and rapidly cool it it does not form condenstaion. Look at your water properties table in the back of your engineering friends' thermo book.
In Rochester you would have hot air in your lines between your engine and your vacuum pump exposed to the cold outside air. Whether or not condensation in the lines form (or in the engine) depends on how much the air in the lines cool (approaching the T at the current P where H2O turns to liquid). Since P in this equation is approximately constant between your state and mine it depends solely on T (absolute, not delta).
Mechanical Engineer, thanks
