##### The Collaborative International Dictionary

**Seah**

Seah \Se"ah\, n. A Jewish dry measure containing one third of an ephah.

##### Wiktionary

**seah**

n. A Jewish dry measure, one third of an ephah.

##### Wikipedia

**Seah**

**Seah** can refer to:

**Seah (unit)**

The ** se'ah** or

**is a unit of dry measure of ancient origin used in Halakha (Jewish law), which equals one third of an**

*seah**ephah*, or

*bath*. Its size in modern units varies widely according to the criteria used for defining it.

According to Herbert G. May, chief editor of two classic Bible-related reference books, the bath may be archaeologically determined to have been about 5.75 gallons (22 liters) from a study of jar remains marked 'bath' and 'royal bath' from Tell Beit Mirsim. Since the *bath* unit has been established to be 22 litres, **1 se'ah would equal 7.33 litres** or 7.33dm.

In the context of a mikveh, a *se'ah* can be about twice as much in order to accommodate even the most stringent rabbinical ruling on immersion. A mikveh must, according to the classical regulations, contain enough water to cover the entire body of an average-sized person; based on a mikveh with the dimensions of 3 cubits deep, 1 cubit wide, and 1 cubit long, the necessary volume of water was *estimated* as being 40 *se'ah* of water. The exact volume referred to by a *seah* is debated, and classical rabbinical literature specifies only that it is enough to fit 144 eggs; most Orthodox Jews use the stringent ruling of the Avrohom Yeshaya Karelitz, according to which **one seah is 14.3 litres**, and therefore a mikveh must contain approximately 575 litres . This volume of water could be topped up with water from any source, but if there were less than 40 seahs of water in the mikveh, then the addition of 3 or more pints of water from an unnatural source would render the mikveh unfit for use, regardless of whether water from a natural source was then added to make up 40 seahs from a natural source; a mikveh rendered unfit for use in this way would need to be completely drained away and refilled from scratch.