[Avodah] K'zayis as weight not volume?

[R Davidovich]

I recently read a teshuva by R'Ovadia Yosef (Yechaveh Daat 1: 16) that gives
the measurement for the k'zayis as a weight, not volume.  Instead of saying
that the k'zayis is 28cc, which comes out to about  1/6 of a hand-matza
according to Rabbi Heinemann's water-displacing  tests, ROY says that  it is
28 grams, which is the approximately the weight of half a hand-matza.  (With
standard issue hand matza, you get about 8 matzos a pound, one slice is two
ounces, or 56 grams.)

I cannot figure out how ROY turned k'zayis and k'beitza into mass!

Does anyone have sources or answers?

-- 
RD
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