3.2 кислород по разности (oxygen by difference): Содержание кислорода в твердом минеральном топливе, рассчитанное по разности между 100 % и суммой влажности, зольности, содержаний углерода, водорода, азота, серы, выраженных в процентах по массе.
Источник: ГОСТ Р 53355-2009: Топливо твердое минеральное. Элементный анализ оригинал документа
Англо-русский словарь нормативно-технической терминологии. academic.ru. 2015.
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