2026-03-08T04:58:05Z https://kobe-c.repo.nii.ac.jp/oai

oai:kobe-c.repo.nii.ac.jp:00001980 2023-06-19T11:23:33Z 40:263:264

マイクロスケール実験によるエタノールと水の密度測定 Density Measurements of Ethanol and Water using Microscale Experiments マイクロスケール ジッケン ニヨル エタノール ト ミズ ノ ミツド ソクテイ 中川, 徹夫 ナカガワ, テツオ NAKAGAWA, Testuo マイクロスケール実験 密度 エタノール 水 microscale experiment density ethanol water P(論文) Densities of liquids such as ethanol and water have been measured using microscale experiments at room temperature. Instead of an even balance and an ordinary graduated cylinder, an electronic balance and a 5- or 10-mL graduated cylinder have been used as equipments. Observed densities of ethanol and water are (0.779 ± 0.001) g・mL-1 respectively, and these values are in good agreement with references. In this procedure, the least amount of ethanol or water used for a density measurement is ca. 1.5mL and it takes ca. 2 minutes. That is, both the amount of reagents and the experiment time are drasically reduced comparing with those in the ordinary experiments. Moreover, our microscale experiment is simpler than the traditional one with a pycnometer because densities are directly measured, not obtained via specific gravity to pure water. Therefore, it has been clarified that our microscale experiment on measuring densities of liquids is useful and informative as teaching materials for high school science. 2011-06-30 jpn departmental bulletin paper https://doi.org/10.18878/00001941 https://kobe-c.repo.nii.ac.jp/records/1980 10.18878/00001941 AN00085725 神戸女学院大学論集 KOBE COLLEGE STUDIES 58 1 113 122 https://kobe-c.repo.nii.ac.jp/record/1980/files/KJ00007674639.pdf application/pdf 706.2 kB 2011-06-01