can some one please help me please

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There is only one known pure substance which, as a liquid, cannot be frozen by cooling alone at 1 atm pressure. Which is it? 





Feb 25th, 2015

Helium, because it is a noble gas and will not freeze unless put under more pressure.

Feb 25th, 2015

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Feb 25th, 2015
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Feb 25th, 2015
Aug 21st, 2017
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