I think a student can measure the density of all substances in just a few days. By the way, I'm wondering whether it is meaningful to talk about the density of one material (specifically soft materials) without reference to its state (water percent.....).
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Dr Yang Gan
Department of Materials Physics and Chemistry
University of Science and Technology Beijing
30 Xue yuan Rd.
Beijing 100083
P. R. China
Tel: 86-10-62334499
Fax: 86-10-62332345
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