So ever since I first saw these things I've wondered, what is inside them? The ends are soldered as though to contain something.
I was a refrigeration tech for a few years, so I know something about thermodynamics. Air is a terrible conductor of heat overall so I have to assume there is something else inside the copper pipes.
I have not had any spares to chop up and see what was in there. I've never examined any that sloshed like there was liquid in there (though if the pipe were completely full it wouldn't). Can anyone kill this curiosity itch and tell me what's inside the copper pipe?
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Gm ls engine