The Soviet RORSAT radar satellites were powered by a NaK-cooled reactor.Apart from the wide liquid temperature range, NaK has a very low vapor pressure, important in the vacuum of space.
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- (相当大的温度范围内仍然是液态,此外,钾钠合金蒸气压非常低,这一点在真空条件下显得尤为重要。)