Reference of Measurements in Halacha: Difference between revisions

|Rav Chaim Noeh<ref>Rav Chaim Noeh in [https://www.hebrewbooks.org/pdfpager.aspx?req=20888&st=&pgnum=270 Shiurei Torah (3:11, pg 191, 5707)] writes that for Deoritta Mitzvot one should eat 28.8cc, however, in [https://www.hebrewbooks.org/pdfpager.aspx?req=35168&st=&pgnum=69 Shiurei Tzion (p. 70, 5709)] he writes that it is 27cc. Vezot HaBracha (Birur Halacha 1) explains that Rav Chaim Noeh retracted from his original ruling.</ref>

|Chazon Ish<ref>Steipler in Shiurin Shel Torah (second edition, 5750, pp. 65-6; first edition, 5716, pp. 86-7) quotes the Chazon Ish that a [[Kezayit]] is 2/3 of a modern egg and an egg today measures between 45-50 grams. At most, the kezayit would be 33.3 grams. Vezot HaBracha (Birur Halacha 1:3) records this opinion of the Chazon Ish as 33.3cc for a [[Kezayit]]. The Chazon Ish's opinion of [[Kezayit]] is partially based on the opinion of the Tzlach who doubles today's eggs to figure out a kebaytzeh ([https://www.hebrewbooks.org/pdfpager.aspx?req=14336&st=&pgnum=118 Chazon Ish OC 39:6]). However, the Chazon Ish also holds that the kezayit is only 1/3 of a kebeytzeh like the Rambam ([https://www.hebrewbooks.org/pdfpager.aspx?req=14336&st=&pgnum=123 Chazon Ish OC 39:17]).</ref>

#A Reviyit is a [[KeBaytzah]] and a half.<ref>Mishna Brurah 486:1 </ref> Therefore, Rav Chaim Noeh holds that the [[Reviyit]] is 86 grams (3 oz),<ref>[https://www.hebrewbooks.org/pdfpager.aspx?req=35168&pgnum=68 Shiurei Tzion (p. 69 n. 6)], [https://www.hebrewbooks.org/pdfpager.aspx?req=20888&st=&pgnum=253 Shiurei Torah (p. 176 3:6)]</ref> the Chazon Ish holds that the [[Reviyit]] is 150 grams (5.3 oz).<ref>Steipler in Shiurin Shel Torah (p. 66) according to the rulings of the Chazon Ish </ref>, and some quote Rav Moshe as saying the Revi'it is 3.3 oz.<ref>Vezot HaBracha (Birur Halacha 1) quotes Haggadat Kol Dodi which quotes Rav Moshe Feinstein as saying that a [[Reviyit]] is 3.3 oz.</ref>

#[[Kedei Dibbur]] is the time it takes to say Shalom Alecha Rebbe,<ref>Kitzur Shulchan Aruch (Klalim s.v. Kedei)

 

Dirshu Chadasha 167:7, M.B. 34, note 22 cites various places where M.B. gives conflicting amounts of time. In some places, M.B. writes the time is 3 words of "Shalom Alecha Rebbi," and in other places M.B. writes the time is 4 words of "Shalom Alecha Rebbi U'Mori." Dirshu concludes the main halacha is the three words time as per most achronim and the implication from M.B.</ref> which is about 2 seconds.