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The se'ah or seah ( Hebrew : סאה ) is a unit of dry measure of ancient origin used in Halakha (Jewish law), which equals one third of an 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 3 .
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 lit