The hectare has a long association with the metric system, but its most recent status has created some ambiguity as to its future application. Richard Brown surveys the lay of the land.
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References
Vincent, J. Beyond Measure: The Hidden History of Measurement (Faber & Faber, 2022).
Décret de la Convention Nationale, Qui établit pour toute la République la même uniformité dans les Poids & Mesures no. 1393 (La République Française, 1793).
Loi du 18 germinal an III relative aux poids et mesures. In Bulletin des Lois de la République Française, 1er série, no. 135, texte no. 749, 1–8 (La République Française, 1795).
Comité International des Poids et Mesures Procès-Verbaux des Séances de 1879 41 (Gauthier-Villars, 1880).
SI Brochure: The International System of Units (SI) (BIPM, 2023); https://www.bipm.org/en/publications/si-brochure
Brown, R. J. C. Metrologia 59, 062101 (2022).
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Brown, R.J.C. A grey area. Nat. Phys. 19, 1948 (2023). https://doi.org/10.1038/s41567-023-02298-8
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DOI: https://doi.org/10.1038/s41567-023-02298-8