Volume of an Etrog

Esrog

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Question

What weight of an etrog is considered kosher?

Answer

Shalom and blessings

The measurement of an etrog is not by weight but by volume, and it should be the volume of an egg - 100 cc according to the Chazon Ish. It should be taken into account that an etrog shrinks, and it must remain at this size until the end of the festival (in a situation where there is no other etrog, see Biur Halacha, Siman תרמח, סעיף כב).

Close to the festival, there are water etrogs [etrogs that were watered with a very large amount of water to reach the required size by the festival], and these etrogs tend to shrink much more.

The method of measurement is to immerse the etrog in water and measure how much water is displaced from the vessel, and immediately afterward, thoroughly dry the etrog so it does not get damaged by the moisture.

If you are in the field or in a store and have a household scale, usually 100 grams is close to 100 cc.

Source

Shulchan Aruch (Orach Chaim, Siman תרמח, סעיף כב). Biur Halacha (there).

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