It is rarely used except in certain specific applications: hectopascal (hPa), in meteorology, for atmospheric pressure, the modern equivalent of the traditional millibar. hectolitre (hl or hL), in agriculture, for liquids (notably wine and milk) and bulk commodities (e.g., grain). hectogram (hg), in agronomy, for quantities of animal feed (hectogram/animal) and for measures of agricultural productivity (hectogram/hectare); also used in Italy abbreviated as etto, and in Canada, New Zealand and Sweden simply as 100 g, for retail sale of cold cuts and meat. hectometre (hm), in radio astronomy, occasionally used to indicate a radio band by wavelength hectare (ha, or 100 ares), in surveying, as a measure of land area equal to one square hectometre, 1 (hm)2 = 10,000 m2 Prefixes adopted before 1960 already existed before SI.
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