hecto-

hecto- (symbol h) is a SI prefix in the SI system of units denoting a factor of 10² (100).

Adopted in 1795, it comes from the Greek ἑκατόν hekaton, meaning hundred.

It is rarely used, except for certain specific applications:

• hectare, [[1 E+4 m²|100 ares]], or 10,000 square metres, a very common measure of land area.
• hectopascal, in meteorology, for atmospheric pressure, the modern equivalent of the traditional millibar.
• hectolitre, in agriculture, for liquids (notably wine and milk) and bulk commodities (e.g. grain).
• hectogram, in agronomy, for quantities of animal feed (hectogram/animal) and for measures of agricultural productivity (hectogram/hectare); also used in Italy, abbreviated as etto, for retail sale of cold cuts and meat.
• hectometre, in radio astronomy, occasionally used to indicate a radio band by wavelength

See also

• SI prefix
• Numerical prefix

Yo face

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