tag:blogger.com,1999:blog-6906205856510467947.post8798051074669050773..comments2018-03-18T04:34:44.990+02:00Comments on Rationalist Judaism: The Kezayis PostJoshhttp://www.blogger.com/profile/02405210530279411496noreply@blogger.comBlogger12125tag:blogger.com,1999:blog-6906205856510467947.post-71025618615022785372018-03-08T08:41:23.897+02:002018-03-08T08:41:23.897+02:00Page 5Page 5Gabrielnoreply@blogger.comtag:blogger.com,1999:blog-6906205856510467947.post-63948402224087668972018-03-06T21:15:35.660+02:002018-03-06T21:15:35.660+02:00There are many other proofs from Chazal that a kez...There are many other proofs from Chazal that a kezayis is indeed the size of a regular olive. See this kuntres from an avreich in Merkaz Harav (the haskamos are interesting too):<br /><br />http://forum.otzar.org/download/file.php?id=39067<br /><br />See also R. Shmuel Tal's comprehensive discussion of the shiurei torah:<br /><br />http://forum.otzar.org/download/file.php?id=56669<br /><br />R. Tal also agrees that a kezayis is the size of a contemporary olive, which he places at 6.5cc. Interestingly, he dissents slightly from R. Hadar Margolin's 75cc reviis (and associated length measurements). He ends up in between R. Margolin and R. Chaim Naeh, with an 80cc reviis and a 46.7cm amah. To my mind, R. Tal's approach has the fewest difficulties of any I've seen.Alannoreply@blogger.comtag:blogger.com,1999:blog-6906205856510467947.post-27187767328547343372018-03-06T21:09:37.014+02:002018-03-06T21:09:37.014+02:00Y. Aharon, the question is what constitutes the vo...Y. Aharon, the question is what constitutes the volume of an egg. Our current day chicken eggs? Eggs used to be smaller. R' Chayim Na'eh's and R' Moshes' weights coincide with today's average US L/XL egg sizes.<br /><br />https://en.wikipedia.org/wiki/Chicken_egg_sizesJewish Israelhttps://www.blogger.com/profile/03375302975538298048noreply@blogger.comtag:blogger.com,1999:blog-6906205856510467947.post-40192080990279258582018-03-06T20:47:42.392+02:002018-03-06T20:47:42.392+02:00Jewish Israel, I wouldn't presume to judge the...Jewish Israel, I wouldn't presume to judge the issue of hafrashat challah - only to provide some guidelines. The volume of flour that requires making a bracha is at least 43.2 egg volumes. An egg volume according to Rav Chaim Naeh (a prevalent view) is 2 fl. oz. According to Rav Moshe Feinstein it is 2.2 fl.oz. Thus the required minimum flour volume is either 86.4 or 95 fl. oz. Of course, the shiur is essentially doubled according to the Hazon Ish. Translating the volume into weights gets us into the question of the bulk density of flours (mass per unit volume of flour strained through a sifter and into a measuring bowl, with minimal or no shaking, to get the volume of a given weight. I have seen different values cited on the internet. If one takes one cited value of 0.67 kg/L, one gets a bit more (4.2) or a bit less (3.8) than 4 lbs of flour for the above volumes (86.4 and 95 fl.oz., respectively). I have also seen a figure of 2.7 lbs flour. More research or more expert opinion is needed to provide a practical determination, i.e., either measure the volume yourself using the above provisos or ask a qualified posek (ask also what is his measure of an egg volume). In case of doubt, separate challah without a beracha.<br /><br />Y. AharonAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-6906205856510467947.post-11137313840150755952018-03-06T15:08:55.040+02:002018-03-06T15:08:55.040+02:00what page on the monograph does it say "the ...what page on the monograph does it say "the Mishnah showing that a kezayis is less than three by three finger-breadths of fabric" ?jacknoreply@blogger.comtag:blogger.com,1999:blog-6906205856510467947.post-60176446972900372562018-03-06T06:47:25.858+02:002018-03-06T06:47:25.858+02:00Can someone please do the math for me?
Tachlis, h...Can someone please do the math for me?<br /><br />Tachlis, how much flour is needed to trigger making a bracha on dough for Hafrashat Challah?Jewish Israelhttps://www.blogger.com/profile/03375302975538298048noreply@blogger.comtag:blogger.com,1999:blog-6906205856510467947.post-80171241574610622512018-03-06T01:50:06.257+02:002018-03-06T01:50:06.257+02:00See Aruch HaShulchan in hilchot Challah where he s...See Aruch HaShulchan in hilchot Challah where he schools the world in grand style on this issue.Israel Colemanhttps://www.blogger.com/profile/09008434388265762388noreply@blogger.comtag:blogger.com,1999:blog-6906205856510467947.post-73431704105181101062018-03-05T23:48:23.203+02:002018-03-05T23:48:23.203+02:00Dangerous because it makes way too much sense ! Dangerous because it makes way too much sense ! DYNAMIC https://www.blogger.com/profile/06166140559223756523noreply@blogger.comtag:blogger.com,1999:blog-6906205856510467947.post-92181391141803876202018-03-05T22:38:43.766+02:002018-03-05T22:38:43.766+02:00This may have been covered during the first iterat...This may have been covered during the first iteration of this post, but it bears repeating. Not only is the Ashkenazy 'kazayit' unrealistic, i.e. 1/3 or 1/2 of a 'beitza' - with 1/2 being more prevalent view, but the volume of the 'beitza' is also made unrelated to actual eggs in these circles. I refer to the view that our egg volumes must be doubled to allegedly make them agree with corresponding measurements involving length (etzba). This notion stems from a measurement of egg volumes made by the sage, Rav Yechezkel Landau, who found them to be 1/2 the volume corresponding to his measurement of an etzba. The means of the measurement of an etzbais is unstated (it's not an easy measurement and requires measuring many people to get a reasonable average). Furthermore, the eggs in 18th century Prague, of which he was the rav, may have been quite small relative to modern eggs. The author of the renowned halachic seifer, the Aruch Hashulchan - a commentary on the entire Shulchan Aruch at the turn of the 20th century, noted that egg volumes had doubled in Lita since the introduction of a new breed of hen. Our large eggs are certainly no smaller than the eggs in Lita, and agree with the corresponding volume based on a more realistic etzba measurement. Rav Moshe Feinstein measured the volume of commercial large (or very large) eggs and found that 1.5 eggs (a reviit) corresponded to the calculated volume of 10.8 cubic etzbaot(the alternative Talmudic measure of a reviit based on his measurement of many people in the lower East Side of NYC. So much for realism. Unfortunately, the prior 'doubling' view still holds force in some circles, having been accepted by the Hazon Ish and some other such authoritative figures. It's a question of choice of authority figures vs. knowledge of reality.<br /><br />Y. AharonAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-6906205856510467947.post-87129221770770803042018-03-05T20:09:23.856+02:002018-03-05T20:09:23.856+02:00Thanks to past articles such as these from Rabbi S...Thanks to past articles such as these from Rabbi Slifkin, Rabbi David Bar Hayim, and Rav Uri Cherki, we have for the past several years been m'kayim mitzvat achilat matzah without the prior agony and overnight side effects.Jewish Israelhttps://www.blogger.com/profile/03375302975538298048noreply@blogger.comtag:blogger.com,1999:blog-6906205856510467947.post-27618946401865157962018-03-05T20:05:29.855+02:002018-03-05T20:05:29.855+02:00With a moniker like "Dynamic Weight Loss"...With a moniker like "Dynamic Weight Loss", you should be more positive about this.<br /><br />:)Jewish Israelhttps://www.blogger.com/profile/03375302975538298048noreply@blogger.comtag:blogger.com,1999:blog-6906205856510467947.post-635164654566353702018-03-05T15:53:10.783+02:002018-03-05T15:53:10.783+02:00" most popular piece" And probably your ..." most popular piece" And probably your most dangerous. DYNAMIC WEIGHT LOSShttps://www.blogger.com/profile/06166140559223756523noreply@blogger.com