measurements relating to the performance of different Mitzvot

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May one eat dairy immediately after tasting a meat item? [duplicate]

I know that there are different customs regarding how long one must wait to eat dairy after eating meat. Let's say one tastes a meat stew or soup to see if it needs more spicing, and this amount is ...
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Length of skirt

If I understand correctly there are two reasons that women wear skirts, 1) to cover the shok 2) to solve the issue of pisuk raglayim. To solve the "shok" cocern I understand that the skirt should ...
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Is there a minimum amount of urine that is considered “Going to the bathroom” for the purpose of making a blessing?

After eating food or drinking beverage, we say a blessing; however, this is only the case if some minimum amount of food or beverage has been consumed. Likewise, after going to the bathroom, we say a ...
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31 views

the regulatory size of a garment in way to be subject to tsitsit [duplicate]

Is there a minimal size of a garment with four corners that makes it duty to tsitsit? Is there a one size fits all?
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1answer
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How does one measure the size of a tallit kattan?

A Judaica store emailed me, yesterday, that they are having a 2 for 1 sale on online purchases. I don't recall my tallit kattan size, and I don't understand the sizing numbers on the online site. I ...
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Taking three steps with limited space

The Shulchan Arukh describes the measurement of the three steps back taken after amidah in OC 122:3 (translation my own): וְשִׁעוּר פְּסִיעוֹת אֵלּוּ, לְכָל הַפָּחוֹת, הוּא כְּדֵי שֶׁיִּתֵּן ...
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Halachic definition of “full” (sated)

I was reading this: After the fact (if one ate between 8 Kezayitim and a definite meal), if one is not full make Al HaMichya and if one is full make Birkat HaMazon, yet, in such a case it’s ...
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114 views

What to do with kiddush cups that are too small?

If one comes to own a kiddush cup that is well under a reviis, is there a way the cup can be used for a mitzvah and not be left in a closet forever? What can be done with a kiddush cup that is too ...
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62 views

Matza eating time limit

Why is there approximately a 4 minute time constrain in which we have to eat the Matzo on the night of the Seder? In other words what is the Halachic and spiritual reasoning behind why we must eat it ...
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1answer
93 views

Difference Between Brit and Medical Circumcision

I have recently encountered a number of non-Jews who were protesting circumcision in front of the U.S. White House. While I found most of their notions somewhat absurd, I was given pause to question ...
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What is the minimum shiur for Shulchan Orekh?

It has been mentioned that abbreviating shulchan orekh at the seder can be a practical way of keeping the seder from going too late. I have also heard rabbis--when asked for leniencies in the amount ...
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38 views

What is Gerah and how much is it?

I would like to know what Gerah(גרה) is. Omer and Cubit are related to human body. What about Gerah? How much is Gerah in modern measurements?
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44 views

How much chessed should one be doing?

Chesed, kindness, is a mitzvah in Judaism. Say people are coming to you all day asking for favors, should one make an effort to do every favor that is asked or is there a sane limit to how much ...
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50 views

Meaning of “emunah shlaima”?

The Rambam's 13 Articles of Faith begin with the statement: "אני מאמין באמונה שלמה" - "I believe with complete faith...", words that then go on to express our faith that God "creates and guides" all ...
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87 views

What is considered the “correct speed” for a Shabbat morning service?

I've had a few discussions with various co-congregants about "fast" and "slow" minyanim. Our shul building has 2 minyanim. The main one has a professional chazzan. We begin Shabbat services at 9 am ...
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65 views

How traditional measurements of Omer fit with Shemot 16:16?

According to this Omer is 2.5 liters or more. This is too much bread per person as specified in Shemot 16:16? How do traditional sources justify the value of Omer? Shemot 16:4,8,12,15 e.t.c calls it ...
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76 views

What is Omer and how much is it?

My understanding is that Omer is a handfuls, which is about 1 US Cup or 236g. This is exact amount needed to produce bread for one day for one healthy adult. What do traditional sources say an Omer ...
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88 views

Is there a halachic time limit for sending an organization its charity box money?

Many Jewish organizations distribute tzedaka (charity) boxes. A few that I know tell people, "collect the money and at some point, empty the money and mail us a check." Let's say someone leaves this ...
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88 views

How much skin is a woman halachically allowed to show from the neck downward?

Is there a requirement to how much skin a woman can show - when going out in public - from where the neck ends to where the torso begins going downward at the top of her shirt? The question is ...
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12 views

Why are Shabbat candles lit 18 minutes before sunset? [duplicate]

My understanding is that the number 18 is the amount of time it takes for an average person to walk 1 mil (side Q, how does this measurement translate to current English or metric units?) Why was ...
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1answer
62 views

3 tefachim minimum height for candles on Chanukah - from the flame itself, or base of the chanukiyah?

For Chanukha Shulchan Aruch (תרעא:ו) writes: ...מניחו למעלה משלשה טפחים To which the Mishneh Berura writes: דכל למטה משלשה כאלו הניח בקרקע ואין ניכר שבעל הבית הניחו שם "For anything ...
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226 views

Minimum amount of food for Beracha Rishona

I've heard much discussion about minimal amounts of food to qualify as eating (eg. this discussion about how much Matza to eat at the Seder). How much would one need to eat in order to say a Beracha ...
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1answer
45 views

Teaching halacha to children with halachically invalid “props”

The Talmud (Sukkah 2b; cited also here) implies that chinukh (educating children in halacha observance) necessitates that the mitzvah be fulfilled according to its halachik details (at least with ...
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How big can a mezuzah be?

I read in the news about an Israeli designer, Yaakov Merdinger, who created the world's largest mezuzah case. As you can see in the photo, the mezuzah case is bigger than the door. Is this kosher?
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How far does one have to go into the ocean to say HaGomel?

When one goes "into" the sea, one is obligated to say HaGomel (see Berachos 54). How far does one have to go to be considered "in" the sea? If one goes swimming on the beach, does one say HaGomel? ...
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229 views

What is the hallachic definition of randomness?

A new Shabbat-friendly technology, KosherSwitch, uses randomly timed light pulses to create various safeks, so that flipping the switch does not hallachically count as switching the light on, even in ...
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2answers
174 views

How long does entire process of baking matzo take to be kosher?

If one would like to bake matzo or use flour to make a Passover food, how long do we have for the process to take place? If 18 min, then is that 18m59s or 18m00s? If the food is cooked before 18 ...
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304 views

Is ice considered food or drink in Halacha?

Is ice considered food or drink in Halacha? So for example, if one would eat an kezais of ice on yom Kippur, but it would not be equal to a reviyis, would he be liable for a chatas?
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89 views

The angle of heseiba and derech cheirus

Heseiba (reclining) is a Rabbinic ordinance of the Passover seder intended to invoke the style of derech cherut ("the way of freedom" - associated with luxury/aristocracy). Some Rishonim (medieval ...
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46 views

Is there a concise book on how math and measurements are used in Torah and talmud?

Both the Torah and Gemarrah use math in various places, e.g. percentages (5ths (certain penalties); 10ths (ma'aser), etc.) They also use many terms of measurements - e.g. shekel = 20 gerah; numerous ...
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Can you carry an object from the step outside your house inside your house?

According to the laws of carrying on shabbos one may not carry from one domain to another aside from a makom petur ("exempt area"). A makom petur is less that 4X4 handbreadths and more than three ...
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157 views

Regarding chametz, what is considered “not fit to be eaten by a dog”?

Regarding whether something needs to be considered chametz or not, there is a general rule of ראוי לאכילת כלב - i.e. - if a dog wouldn't eat it, then it's not considered food and therefore it is not ...
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Would halachic units be shrunk if a person was (Honey, I Shrunk the Kids-style)?

In the classic move Honey, I Shrunk the Kids and its sequels, people get shrunk down to 1/264th of their normal size. So, a person is around 1/4 of an inch tall. If such a thing were even possible, ...
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What Bracha acharona on .5 kezayit of grapes eaten together with .5 kezayit of mezonot crackers?

What Bracha acharona on .5 kezayit of grapes eaten together with .5 kezayit of mezonot crackers? Do you say al hamichya ve'al haetz or is it boreh nefashot since neither is a kezayit? Please provide ...
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93 views

What is the the amount a person who feels weak on a fast day could eat or drink?

What is the the amount a person who feels weak on a fast day could eat or drink. How many ounces and how often?
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148 views

(Tefach) Wide Gartel

Some use a very wide gartel. A friend of mine mentioned an inyan (Judaism-sourced idea) that the gartel should be wider than one tefach. Can someone source this inyan that the gartel should be (more ...
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51 views

Menorah 20 Amos above ground level

One does not fulfill his or her obligation of lighting the menorah if it is 20 Amos above since it is not easily seen. The Rambam in Hilchos Shabbas 17:15 writes that a beam over a mavoi with ...
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53 views

Do brachos on seeing have to be made within four amos?

Is there any source that says that in order to make a bracha for seeing e.g., a sage of Israel, a sage of the nations, or an unusual animal, one must be within four amos of the person/thing? I found ...
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97 views

What was the volume of oil for one day's lighting of the Menorah?

Large jars for storing oil or wine were common in Judah. For 100’s of years, oil and wine were the commodities that were used to pay tribute and taxes. Many storage jars were standardized and may ...
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How big can a chanukia get?

I recently saw this story about students at YU who lit up their dorm windows to turn the entire building into a giant chanukia (just the form, not a real one). That inspired a question: Exactly how ...
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1answer
99 views

What is the shiur Hanaah?

How much Hanaah (physical benefit) must one have of things prohibited as an Issur Hanaah (things forbidden for benefit) like milk and meat, Kiley HaKerem (certain grape mixtures), or Avoda Zara (...
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What did they do for shiurim before modern measurements?

In recent centuries, authorities such as the Chazon Ish, Rabbi Chaim Na'eh, and Rabbi Moshe Feinstein ruled on the exact size of a tefach, ammah, kezayit, and other shiurim. What did people do before ...
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Has there been a discussion of changing the maximum height in halacha?

In halacha certain things are considered invalid because the exceed the maximum height which people will notice, 20 amos (menorah, sukkah, korah). In modern times many (most?) people live in areas ...
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What's the definition of “not now” for priority-of-b'racha purposes?

Orach Chayim 211 is about what food to recite a blessing over (that is, and eat) first when one wishes to eat two foods. It's clear that (except according to the Rambam cited in 211:2) one does not ...
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140 views

Measurements for the Bais HaMikdash — can we do it with a computer?

Since everything is computerized now, when the Bais HaMikdash is rebuilt, will we use the computer to rebuild? I.E., the measurements for the offerings, the entire rebuilding, etc.?
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Is there a “5 second rule” for foods becoming non-Kosher?

OK so I don't actually mean a 5 second rule. But is there an amount of time that it takes for something hot that comes in contact with a non-Kosher utensil or surface to become not kosher? For ...
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1answer
28 views

How much invalid material invalidates schach?

How much invalid material invalidates schach? (tefachim + inches preferred, but not required) Would it make a difference if this material was in the middle of the roof, or on the side (=next to the ...
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137 views

How much of a gap in schach is acceptable?

How large of a gap is allowed in a sukkah's schach (roof) without invalidating it? (in tefachim and inches/feet, if possible) Would it make a difference if the gap was in the middle of the roof, or ...
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L'Hafrish Challah with Dough Made by Multiple Women?

I am wondering if small portions of dough, made by separate women in a challah baking class (thus each small portion would be owned by a single woman), can be combined to create the requisite amount ...
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Must the entire decoration be within 4 t'fachim of the schach?

Inspired by Can too many decorations render a sukkah invalid? If there is a big decoration hanging from the schach, is it OK as long as the top (part, or most of the decoration) is within 4 tefachim, ...