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I am working on fabricating the icyball system. I am planning to charge it with the help of convex mirrors. Whether it is necessary to create a vaccum inside the refrigeration closed cylinders before filling ammonia?

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  • $\begingroup$ These refrigerators are not very efficient anyway, but for demonstration purposes, it will work, albeit even less efficiently, with residual air. $\endgroup$ – DrMoishe Pippik Feb 4 at 21:26

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