[Avodah] K'zayis as weight not volume?

[Zev Sero]

Ken Bloom wrote:

> Yalkut Yosef (in the halachot of the seder, Motzi Matzah) says that one
> measures according to mass in all cases (even when it's not Pesach),
> because measuring by mass is easier (just use a scale) than measuring by
> volume (which requires compressing the air out of the food or grindingit
> up or something). Since the Kaf HaHayyim says likewise, this is not
> ROY's innovation -- it's accepted sephardic mesorah.

It's not sephardic mesorah, it's just common sense, to use an easy
method of measurement instead of a difficult one.  But having determined
the mass, one must then apply a conversion factor to get the volume,
which (lechol hade'ot) is what matters halachically.

In the case of matzah, the traditional conversion factor happens
to be 1.  It appears that experimental data contradicts that tradition;
if verified then the practise needs to be re-evaluated.  Maybe sefardi
matzot are denser than the ones Ashkenazim use today.

-- 
Zev Sero               Something has gone seriously awry with this Court's
zev at sero.name          interpretation of the Constitution.
                       	                          - Clarence Thomas