直観的性状判断の『カギ』情報としての流れるものの運動学的特徴 -動きと感覚の相互関係-

概要

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Why can we instantaneously recognize a powder in flow as a distinct type of matter from a liquid only in its kinematic appearance? Powders are often mentioned in analogy to liquids since they are considered as"flowable" objects that behave more or less like liquids. However, this apparently justifiable analogy isconsiderably puzzling and misleading. Actually, we are not likely to mistake a powdery system in ﬂow as aliquid. Our unconscious and everyday verbal expression for the most typical physical feature, flowability, leadsus to a predominant and obstinate bias toward indentifying the characteristics of powders as those of liquids.Nevertheless, we should start with finding the difference in the kinematic observable facts between powdersand liquids within the range of the shared feature in predicative and adjective expression, "flowable". In thiswork, the author attempts a radical discussion on the unavoidable risk of falling into a tendency of making upchancy stories for reasoning the observed phenomena based on miscellaneous "leaned knowledge in textbooks"about powders and particles. As an example, an observational study for clarifying the most essential differencein the kinematics between water and sand is concisely summarized in the last part ofthis report to show that theclue for distinguishing different types of flowable matters are to be found in the common feature in the verbalexpression, "flowability".
2012-00-00