rontogram

English

Etymology

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 The Guardian‎^[1]:

     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.