The teshuva I cited seems to say that 28 grams of matza need to be eaten, not 28 ccs. He even mentions using a scale to weigh the 28 grams, not 14 grams. He mentions no conversion from mass to or from volume. That would make his kzayis shiur half a hand-matza, not a quarter. <br>
<br>Do you think he was inexact and meant cc's? <br><br><div class="gmail_quote">On Fri, Apr 11, 2008 at 8:55 AM, Gil Student <<a href="mailto:gil.student@gmail.com">gil.student@gmail.com</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I don't know what ROY says but R. Mordechai Willig also uses weight (I<br>
will be"H be posting his calculations early next week). The real issue<br>
is mass but weight can be used to calculate mass if you have the<br>
appropriate conversion factor.<br>
<br>
28 ccs of water weighs 28 grams. If something has the same density as<br>
water and weighs 28 grams, then it has a mass of 28 ccs. Experiments<br>
have shown that handmade shemurah matzah has approximately half the<br>
density of water so 14 grams of handmade shemurah matzah has about a<br>
mass of 28 ccs. Therefore, if you eat 14 grams (half an ounce) of<br>
handmade shemurah matzah, you have eaten 28 ccs, which is a ke-zayis<br>
according to ROY.<br>
<br>
I believe an average handmade shemurah matzah weighs a over 2 ounces.<br>
So ROY's shiur of ke-zayis is under 1/4 of an average matzah.<br>
<div><div></div><div class="Wj3C7c"><br>
<br>
<br>
<br>
On 4/11/08, R Davidovich <<a href="mailto:raphaeldavidovich@gmail.com">raphaeldavidovich@gmail.com</a>> wrote:<br>
> I recently read a teshuva by R'Ovadia Yosef (Yechaveh Daat 1: 16) that gives<br>
> the measurement for the k'zayis as a weight, not volume. Instead of saying<br>
> that the k'zayis is 28cc, which comes out to about 1/6 of a hand-matza<br>
> according to Rabbi Heinemann's water-displacing tests, ROY says that it is<br>
> 28 grams, which is the approximately the weight of half a hand-matza. (With<br>
> standard issue hand matza, you get about 8 matzos a pound, one slice is two<br>
> ounces, or 56 grams.)<br>
><br>
> I cannot figure out how ROY turned k'zayis and k'beitza into mass!<br>
><br>
> Does anyone have sources or answers?<br>
><br>
> --<br>
> RD<br>
><br>
<br>
</div></div><font color="#888888">--<br>
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</font></blockquote></div><br><br clear="all"><br>-- <br>RD