rontogram

English

Alternative forms

Etymology

From ronto- +‎ gram.

Noun

rontogram (plural rontograms)

  1. (metrology) An SI unit of mass equal to 10−27 grams. Symbol: rg
    • 2022 November 18, Ian Sample, “Earth weighs in at six ronnagrams as new prefixes picked for big and small”, in Katharine Viner, editor, The Guardian‎[1], London: Guardian News & Media, →ISSN, →OCLC, archived from the original on 17 October 2026:
      The arrival of the new prefixes means the Earth can now be said to weigh six ronnagrams, and Jupiter about two quettagrams. An electron weighs about a rontogram, and a single bit of data stored on a mobile phone adds about 10 quectograms to its mass.
    • 2023 January 23, Elizabeth Gibney, “How many yottabytes in a quettabyte? Extreme numbers get new names”, in Nature, →DOI:
      Earth’s mass is on the order of a ronnagram, and an electron’s mass is about one rontogram.
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