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Water collects in the receiver when it is at low temperature. When the air is compressed it follows Gay-Lussac's law. P1/T1=P2/T2 at 70F or 294k if you compress air from 1bar to 10bar the temperature goes to 2940K or 4832F. This may seem impossible, but it's how the math works. The air never actually reaches this temperature because of the low specific heat capacity of the air and the losses to the compressors cylinder, but the temperature is hot enough to keep the water from condensing. At 10bar the boiling point of water is 453k. Thanks for making me shake the rust off though, been a while since I'd used that information, and it makes everything make a bit more sense here. I was dumb to say evaporation. That only happens quickly before you hit 100% humidity when injecting.
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