A scientist could measure the boiling point of a piece of metal the same way he or she would measure the boiling point of any other substance. You would subject the piece of metal to a measured amount of heat in a controlled fashion. First, the metal would melt from a solid to a liquid (the melting point). Then, the liquid metal would start to bubble and produce vapor at the boiling point. For most chemicals this would not be too difficult a study to perform. You would only require a heat source like a hotplate and thermometer. The difficulty in doing this with a metal is that most metals tend to have extremely high melting points. For example, nickel has a boiling point of almost 3,000 degrees C. So the difficulty would arise here in obtaining a heat source that could reach that temperature and also obtaining a thermometer that can operate at that temperature.
Does anybody know the etymology of the phrase "sweet dreams"? I tried googling but did not find anything satisfying. Is this a relatively new phrase of the modern world or has this been in use for some time? I think it's the latter one. Answer The OED has the interjection as "a farewell to someone going to bed" from the 20th century: 1908 Sears Roebuck Catal. 198/1 Tenor Solos..Good Bye, Sweet Dreams, Good Bye. But it goes back until at least the 19th and possibly 18th centuries. John Wolcot, writing under the pseudonym of Peter Pindar, used it in his poem "Orson and Ellen; A Legendary Tale" published in 1801: Also from 1801 in The infernal Quixote (Page 287) by Charles Lucas: In the March 1776 of The Universal Magazine was published "The Serenade. A Pastoral Tale. From the German of Gesner" , where the shepherd Daphnis watches over his beloved as she sleeps and sings: The same tale appears in 1776's as Idyl XI, " Daphnis ...
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