measurements relating to the performance of different Mitzvot

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the measurements of Noah's arc and the arc of the covenent [on hold]

The volume of Noah's Ark is 450,000 cubic cubits. The volume of the Ark of the Covenant is 5.625. Noah's Ark was thus exactly 80,000 times larger than the Ark of the Covenant. Is it significant that ...
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104 views

How many Oreos in a kezayis?

For standard Oreo cookies, how many would be a kezayis by volume? I have heard maybe 2.5 or maybe 3.
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How does one do Hagalah above 12,000 feet?

How does one do Hagalah above 12,000 feet, where water's boiling point falls below 190°F? Under normal circumstances, the water will not be Rochsim, and therefore unsuitable for Hagalah. Using a ...
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Soldier's Shovel

Is there a shiur for the item the soldier is obligated to carry in Devarim 23:14? וְיָתֵד תִּהְיֶה לְךָ עַל אֲזֵנֶךָ וְהָיָה בְּשִׁבְתְּךָ חוּץ וְחָפַרְתָּה בָהּ וְשַׁבְתָּ וְכִסִּיתָ אֶת צֵאָתֶךָ ...
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Kaddish yatom: what if a parent really *is* wicked?

I understand that a soul may be judged for a full 12 months after death but that we (generally) only say kaddish yatom for a parent for 11 months because the longest period is for the worst sinners ...
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125 views

Why are we required to light Chanukah lights only for about half an hour?

Since the miracle of the oil of Chanukah was that from one flask of oil they miraculously had enough oil for the menorah to burn all night for eight days, why did Chazal require us to light only for ...
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challah bracha on separate dough balls

I understand a bracha on dough is made if the amount of flour is greater than a certain amount, sourced here. I have a small food processor I use to knead the dough. I plan to make a bunch of dough ...
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How is a ten tefachim wall hard to use?

The Gemara in Eiruvin 77a says that when a ten tefachim wall is between two courtyards, but is less than that to one courtyard (the floor of the courtyard is heigher), we give it to the one which is ...
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97 views

how much water do you need for a Netilat Yadayim

When washing your hands for Netilat Yadayim, how much water do you need for Netilat Yadayim?
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87 views

Shiur for kiddush rabba mezonos

When we make kiddush rabba with mezonos before having a real meal with bread, is there a shiur for how much mezonos a person should eat in order for it to be yotzei kiddush? Does it matter whether the ...
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3 Pesukim minimum per Aliyah

Why is it that each aliyah for Krias Hatorah has to be 3 pesukim at minimum? I know that the minimum for an entire krias Hatorah on a weekday is 10 pesukim (with the exception of Purim being 9 ...
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96 views

How long does it take to become a kofer?

If a person for whatever reason momentarily has a thought which denies God, but then afterwards reaffirms his belief in Hashem, is that an act of kefira? Does a momentary lapse in belief constitute a ...
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201 views

Which shita are those wearing extra long tallit katan following?

Some rabbonim are wearing really long and large talith katan. For example Rav Shmuel Auerbach shlita (picture below). Rav Elyashiv ztl used to wear a very long one too. Which shita are they ...
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Is there a legal minimum on the amount of soil needed to make a suitable grave?

This is not being asked for any pragmatic need. I had the thought about people living off of planets. Without getting into the issue of whether a burial can take place anywhere beside Earth, I ...
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31 views

Is there a concept of giving a fatter sacrifice?

Is there a concept of giving a fatter sacrifice as opposed to a smaller one? I believe the Torah says there are different levels of sacrifices depending on your wealth (e.g. a cow vs. a bird vs. ...
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133 views

Which is the height considered 3 tefachim for not “praying in height”? (30cm?)

Recently we had to make a synagogue for one day at a hall, and we used a scaffold for the Shaliach tzibbur to be well heard by all the public. The Scaffold was 1m x 1.5m, and I don't remember the ...
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Aruch Hashulchan's moon-distance estimate

Aruch Hashulchan, Orach Chayim 397:1, says that a מיל is the same as a Russian верста (verst) or 500 сажен (sazhen), which comes to 1066.8 meters. In 426:2, he says the distance to the moon is about ...
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116 views

Satmar Rebbe's opinion on Mechitza

Where could I find the opinion of the Satmar Rebbe (Rav Yoel) zt'l on the height and laws pertaining to the Mechitzah?
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94 views

What's the Shiur of Mashehu?

Certain issurim (forbidden things) can become batel (halachically nullified) if they were unintentionally mixed in heter (permitted things). In order for this to happen, the heter must outnumber the ...
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Can we really estimate halachic distances?

A mishna on Eiruvin 41b tells of a ship that was coming into harbor at dusk coming into Shabbat. Since Shabbat had already begun when the ship docked, those on board asked R. Gamaliel if they could ...
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Shiur of “Miut Hamatzui”

A "miut hamatzui" is a phrased used to express a case where because of a small concern that something exists, or might happened, or does happen that the halacha is affected by this. An example is if ...
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50 views

Challah dough that loses its amount

A theoretical question: Someone was making a dough and in the process a large piece fell out from the mixture onto the floor. They had made exactly the right amount in order to take challah with a ...
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Violating the prohibition of wearing Sha'atnez

When does one become liable for wearing Sha'atnez? Is it merely putting the garment on one's body? Is it when the act of dressing is complete (ie., buttoning the last button, zipping up the zipper, ...
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321 views

What is the absolute minimum length for peyos?

I have often heard that 1/4th of an inch is the minimum length of the hairs in the peyos area. For example, that is mentioned in an answer to a previous question: How to advise your barber My ...
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117 views

What's the Source for Jerusalem and Sepphoris Having Larger Measuring Units?

In Rabbi Pinchas Kehati's introduction to Masekhet Challah, and again in his commentary on Eduyyot 1:2, reference is made to the adjusting of measurements when the Jews "arrived at" Jerusalem, and ...
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54 views

How many calories are in a KeZayith of flour?

I've often wondered how I can be sure I've eaten a KeZayith of flour when I eat something small but complete - like one cookie - and struggle with the decision of whether or not to eat more in order ...
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A shorter person with a normal sized tallis katan

A theoretical question: If a young person (a boy for example that is 13 yrs old) that happens to be very short (not because of any physical disability) wears a normal size tallis katan it will be very ...
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72 views

Bentching Ha-Gommel after a Birth

After a woman gives birth many have the custom of reciting the blessing of "ha-gommel" (a blessing of Thanks.) Until how long after a birth may this blessing by recited? (i.e. can it be said even a ...
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160 views

What is the shiur for anointing on Yom Kippur?

Is there a minimum shiur to be chayav for anointing on Yom Kippur, and, if so, what is it? The gemarah (Yoma 76b) seems to learn it out as a comparison to food consumption: would that mean it has the ...
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197 views

Kapparos on money - How much?

If one does the Minhag of Kapparos on money, how much money should be used for each person? (Sources.)
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How obligated is one to say Kaddish for a deceased relative?

People often talk about an obligation -- Chiyuv -- to recite Kaddish at every opportunity for some time after the death of a relative. (Which relatives are obligated and for how long does not seem ...
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Delaying using the toilet

According to Gemara Makkot 16b, the phrase in Vayikra 20:25 ... and do not make your souls disgusting - וְלֹא תְשַׁקְּצוּ אֶת נַפְשֹׁתֵיכֶם is a command not to hold in the urge to urinate or ...
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301 views

Challah Loaves on Shabbat have a minimum size?

In this article regarding the Shabbat Challah loaves, The Shmirat Shabbat KeHilchata (vol. II 55:5) is quoted as saying: The loaves must each be at least the size of an olive Normally, the size ...
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Beis Shammai's dinar for kiddushin - philosophy?

The Mishna in Kiddushin (1:1) outlines a machlokes regarding the minimum amount of money necessary to effect kiddushin (i.e. create a marriage). According to Beis Hillel, the amount of money (or ...
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351 views

Upper limits of “kovea itim”

It is known from the gemara (Shabbos 31a and cited in maamar Toras HaBayis ch. 1, among other places) that when a person dies, he is asked if he had set times for learning. I know that these times can ...
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Why does Ezekiel describe the maneh as 20 + 25 + 10 + 5 shekels instead of just saying 60?

Ezekiel 45:12, in discussing just weights and measures, says: וְהַשֶּׁקֶל, עֶשְׂרִים גֵּרָה; עֶשְׂרִים שְׁקָלִים חֲמִשָּׁה וְעֶשְׂרִים שְׁקָלִים, עֲשָׂרָה וַחֲמִשָּׁה שֶׁקֶל--הַמָּנֶה, יִהְיֶה ...
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108 views

What is the minimum shiur for dehydrated maror?

Given that you can use dried maror for the seder (Mishna Pesachim 2:6), and assuming that horseradish is actually maror, what is the minimum shiur of dried horseradish (e.g. horseradish powder)? Is it ...
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190 views

Figuring out a K'zayit by weight/volume of ingredients

In this question, I learned that one measures the amount of flour used to determine whether challah separation is necessary. Here I learned that there is a difference of opinion between (some) ...
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146 views

What is the source for the current Shiurim that we have?

There are generally two types of Shiurim, the "classic" type (R' Avrohom Chaim Noeh) which says that when we measure an Amah nowadays it is roughly the size of an Amah in the time of the Beis ...
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192 views

How big, and what exactly, is “Kedei Kelipah”?

{Kedei Kelipah is a term used in Kashruth for the amount of something that needs to be removed in order to allow one to treat the remnant as Kosher. (This only applies under certain conditions, which ...
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240 views

The size/shape of biblical Israel

Based on this Tosafot in Bava Metzia 28a (D"H Chamisha Asar Yom), Eretz Israel is a square (400 sq. Parsah), and the distance between Jerusalem and the Jordan river is 1/39th the distance between ...
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170 views

No mitzvah to wear tefillin every day?

I heard that the Bet HaLevi and the Peri Megadim hold that there is no Mitzva for a person to don Tefilin everyday. Can someone source these opinions and explain exactly what they are meaning to say?
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Within what time frame does one have to give maaser on a large sum?

If someone suddenly has a large sum of money from a lottery or inheritance or gift, how much time does one have to disperse maaser money from that?
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152 views

TzitTzit length

Once the TzitTzit have been tied, is there any requirement about their length?
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196 views

How long until a bean chulent is totally cooked (mevushal kol tzorko)?

My son has started raiding the chulent Friday night. To be able to return the chulent crock pot back to the casing, everything must be fully cooked. I rarely cook with beans, but would like to try ...
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Connection of Toch Kedei Dibbur to Walking 4 Amot

According to this, the gemara compares Toch Kedei Dibbur (the length of time neccasary to greet someone; see Shalom alecha rebbi (u'mori) ) to the time it takes to walk 4 amot (cubits). Thus, with ...
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685 views

18 minute Matzah?

Are there sources EXPLAINING why we have to make matzah within 18 minutes? I understand having a time limit if in fact the reason we eat matzah is to reenact the speed which we left Egypt (that ...
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94 views

Is there a minimum size for Chanuka flames?

Do the flames atop the chanukiya need to be a certain size to be valid? At the extreme, are tiny (but sustained) balls of blue flame sufficient?
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129 views

Eating out Friday night of Chanukkah

If one is lighting Chanukkah candles inside (for whatever reason) relying on the publicization to himself and his family, then what should he do on Friday night if he is eating out? Must he make the ...
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252 views

Is there a time limit for Borei Nefashos and Beracha Me'en Shalosh?

It seems that there's a 72-minute period after eating in which one must bentch. Does this also apply for Borei Nefashos and Beracha Me'en Shalosh?