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Who knows two hundred seventy-three?

Please cite/link your sources, if possible.

At some undetermined point in the future, at least a day from now, I will:

  • Vote up all interesting, relevant answers.

  • Accept what I consider the "best" answer.

  • Move on to the next number.

Gemar chatima tova, everybody!

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Hm, any halachos that kick in at 273 Kelvin? – msh210 Oct 11 '11 at 19:03
@msh: sure! For example, that would be the minimum temperature of H2O used for nisuch hamayim. – Alex Oct 11 '11 at 19:35
up vote 4 down vote accepted

A beis kor (the area in which a kor, about 500-700 lb., of grain can be sown) is defined in halachah as 75000 square cubits. Rashi (to Kiddushin 60b, ד"ה בית כור) points out that this is a square a bit more than 273 5/6 cubits to a side (and indeed, √75000 ≈ 273.86).

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There were 273 more first-born men than l'viyim in Bamidbar.

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