A general term for an instrument that measures the moisture content of a substance. Substances come in three states: solid, liquid, and gas. Moisture meters that measure the content of water vapor in gas are often distinguished as hygrometers. Methods for measuring moisture include (1) weighing, (2) density, (3) humidity, (4) chemical, (5) electrical, and (6) optical. (1) is the standard method because it directly determines the moisture content by heating the sample to evaporate the moisture and measuring the change in the sample's mass before and after. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
物質中に含まれている水分を測定する計器の総称。物質には固体,液体および気体の3態があり,気体中に含まれる水蒸気の含有率を測定する水分計をとくに湿度計として区別することが多い。水分の測定方法には,(1)秤量法,(2)密度による方法,(3)湿度による方法,(4)化学的方法,(5)電気的方法,(6)光学的方法などがある。(1)は試料を加熱して水分を蒸発させ,その前後の試料の質量変化を測定して含水率を直接求める方法であるから基準となる。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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