Assertion: metal's boiling point | /r/HasProperty | uncertain
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Source sentences:
text: The estimated boiling point of 620 °C (1150 °F, 890 K) is also uncertain; the estimate 598 °C (1108 °F, 871 K), as well as the extrapolation from Mendeleev's method of 640 °C (1180 °F, 910 K), have also been suggested.