The low freezing temperatures and high thermal conductivities of metal ammonia solutions make them attractive as heat transfer fluids in the range from +60 to −185 deg C, offering a potential substitute for the cryogenic boiling heat transfer usually required below −50 deg C. Although chemically metastable and highly corrosive, some of these solutions have been studied at 190 deg C for an hour without measurable decomposition and have been stored for years at room temperature.

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