hydrogen

Part of speech: noun

A colorless, odorless, tasteless, gaseous element, the lightest substance known.

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Usage examples "hydrogen":

  1. In fact, sodium was so strongly represented in this comet, that both the head and the tail could be perfectly well seen in sodium light by merely opening the slit of the spectroscope very wide, just as a solar prominence may be seen in hydrogen light. - "The Story of the Heavens", Robert Stawell Ball.
  2. In the case of methylene blue, reduction consists in the addition of two hydrogen atoms. - "The Nature of Animal Light", E. Newton Harvey.
  3. The early observations of Francis Bacon and Bishop Wilkins paved the way for the later achievement, whilst it was our own Cavendish who discovered that hydrogen gas was lighter than air; and Dr. Black of Edinburgh, who first employed that gas to raise a globe in which it was contained from the earth. - "Wonderful Balloon Ascents or, the Conquest of the Skies", Fulgence Marion.