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:''This article is about the science of measurement. For the study of weather see Meteorology.'' Metrology is the science of measurement. Metrology includes all theoretical and practical aspects of measurement. Metrology is defined by the ''International Bureau of Weights and Measures'' (BIPM) as "the science of measurement, embracing both experimental and theoretical determinations at any level of uncertainty in any field of science and technology."〔 〕 The ''ontology'' and international vocabulary of metrology (VIM) is maintained by the Joint Committee for Guides in Metrology (JCGM), a group made up of eight international organisations – BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, OIML and ILAC. Metrology is a very broad field and may be divided into three basic activities, though there is considerable overlap between the activities: *Definition of internationally accepted units of measurement. *Realisation of these units of measurement in practice. *Application of chains of traceability linking measurements made in practice to reference standards. Metrology also has three basic subfields, all of which make use of the three basic activities, though in varying proportions:〔 *Scientific or fundamental metrology *Applied, technical or industrial metrology *Legal metrology ==Scientific or fundamental metrology== Scientific or fundamental metrology concerns the establishment of ''quantity systems'', unit systems, ''units of measurement'', the development of new measurement methods, realisation of measurement standards and the transfer of traceability from these standards to users in society. The BIPM maintains a database of the metrological calibration and measurement capabilities of various institutes around the world. These institutes, whose activities are peer-reviewed, provide the top-level reference points for metrological traceability. In the area of measurement the BIPM has identified nine metrology areas including length, mass and time.〔(【引用サイトリンク】The BIPM key comparison database )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「metrology」の詳細全文を読む スポンサード リンク
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