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Updated: May 16, 2025
Then he turned on more of the illuminating gas, which, coming through the Bunsen burner, was made intensely hot. A little column of flame now enveloped the big test tube containing the powder. There was a little crackling sound as the heat expanded the powder, and the end of the test tube became quite red from the flame. "That tube'll melt!" exclaimed Mark, peering over the pile of books.
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