Reference of Measurements in Halacha: Difference between revisions
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Reference of Measurements in Halacha (view source)
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*Chazon Ish OC 39:17 decided that we could be lenient like the Rambam. See below for an exact amount according to Chazon Ish. | *Chazon Ish OC 39:17 decided that we could be lenient like the Rambam. See below for an exact amount according to Chazon Ish. | ||
*Background: According to the Ri (Tosfot Yoma 80b) a kezayit is equal to half an egg. He is based on the gemara Yoma 80a that a person can swallow an egg one time and Keritut that a person can swallow two olives at one time. According to the Rambam it is less than a third of an egg. The Rambam holds like Rabbi Yochanan Ben Broka who says that two meals is the volume of 6 eggs (Eruvin 82b) and two meal is also equal to 18 dates (Eruvin 80b). Since the date is bigger than an olive (Yoma 79b) the kezayit is less than a third of an egg. According to rabbenu tam it is less than 30% of an egg. Gra 486 answers the questions for each approach. Rabbenu Tam says we follow Rabbi Shimon who holds that two meals is 5.33 eggs (Eruvin 38b) since according to him the general amount of a loaf is 8 eggs which is broadly accepted in gemara as the primary volume for tumat ochlin which is 1/8 of a loaf. Since two meals is 18 dates (Eruvin 80b) and a date is larger than an olive (Yoma 79b) the olive must be less than 8/27 of an egg. Gra 486 explains each opinion in depth. He answers why the Rambam wasn’t concerned about tumat ochlin since the gemara was discussing an egg without a peel which is 66% the size of a regular egg and the size of an egg for tumat ochlin isn’t precise. That also answers the discrepancy of whether a person can swallow two olives or an egg, the egg discussed is an egg without a peel. He also adds that the Rambam held like Rabbi Yochanan Ben Broka because the Mishna in Peah 8:6 follows his opinion but Tosfot argue that Peah which is biblical isn’t a proof for the size of a meal for eruvin which is rabbinic.</ref> | *Background: According to the Ri (Tosfot Yoma 80b) a kezayit is equal to half an egg. He is based on the gemara Yoma 80a that a person can swallow an egg one time and Keritut that a person can swallow two olives at one time. According to the Rambam it is less than a third of an egg. The Rambam holds like Rabbi Yochanan Ben Broka who says that two meals is the volume of 6 eggs (Eruvin 82b) and two meal is also equal to 18 dates (Eruvin 80b). Since the date is bigger than an olive (Yoma 79b) the kezayit is less than a third of an egg. According to rabbenu tam it is less than 30% of an egg. Gra 486 answers the questions for each approach. Rabbenu Tam says we follow Rabbi Shimon who holds that two meals is 5.33 eggs (Eruvin 38b) since according to him the general amount of a loaf is 8 eggs which is broadly accepted in gemara as the primary volume for tumat ochlin which is 1/8 of a loaf. Since two meals is 18 dates (Eruvin 80b) and a date is larger than an olive (Yoma 79b) the olive must be less than 8/27 of an egg. Gra 486 explains each opinion in depth. He answers why the Rambam wasn’t concerned about tumat ochlin since the gemara was discussing an egg without a peel which is 66% the size of a regular egg and the size of an egg for tumat ochlin isn’t precise. That also answers the discrepancy of whether a person can swallow two olives or an egg, the egg discussed is an egg without a peel. He also adds that the Rambam held like Rabbi Yochanan Ben Broka because the Mishna in Peah 8:6 follows his opinion but Tosfot argue that Peah which is biblical isn’t a proof for the size of a meal for eruvin which is rabbinic.</ref> | ||
#According to Rav Chaim Noeh, the [[Kezayit]] for Deoritta measures (eating [[Matzah]]) and [[Bracha Achrona]] is 27cc. The Chazon Ish’s opinion is that the [[Kezayit]] is 33.3 grams (1.3 oz). <ref>*The Tzlach (Pesachim 116b) holds that the modern day eggs are half the size of those in the days of Chazal. However, Rav Noeh (Shiurei Torah Shaar 3) argues that the modern day eggs have not changed from the days of Chazal. Mishna Brurah 486:1 writes that for the mitzvah deoraitta of [[matza]], one should follow the stringent view of the Tzlach. | #According to Rav Chaim Noeh, the [[Kezayit]] for Deoritta measures (eating [[Matzah]]) and [[Bracha Achrona]] is 27cc. The Chazon Ish’s opinion is that the [[Kezayit]] is 33.3 grams (1.3 oz).<ref>*The Tzlach (Pesachim 116b s.v. vhoil) holds that the modern day eggs are half the size of those in the days of Chazal. However, Rav Noeh (Shiurei Torah Shaar 3) argues that the modern day eggs have not changed from the days of Chazal. Mishna Brurah 486:1 writes that for the mitzvah deoraitta of [[matza]], one should follow the stringent view of the Tzlach. See Rav Shlomo Wahrman (Orot Haesach 28) who explains why there is no need to say that the eggs have shrunk since the times of the Gemara. See also Maaseh Rav 74, where it says that the Gra accepted the position of the Tzlach. | ||
*Practically, how much is a [[Kezayit]]? | *Practically, how much is a [[Kezayit]]? | ||
**(1) Rav Chaim Noeh in Shiurei Torah (3:11, pg 191, 5707) writes that for Deoritta Mitzvot one should eat 28.8cc, however, in 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. | **(1) Rav Chaim Noeh in Shiurei Torah (3:11, pg 191, 5707) writes that for Deoritta Mitzvot one should eat 28.8cc, however, in 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. | ||
