New Scientific Teaching Method on Laundry in Home Economics Class Junior High School : Application of Surface Tension Measurement for Understanding Functions of Detergents

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The aim of this study is to develop a class for clothing management in the Junior High School Home Economics. Students acquire a scientific concept of laundry by this study of clothing management. An experiment to evaluate detergents was developed and practiced for this class. Students' experiment work sheets were analyzed. All students could confirm that when the surface tension decreased, it was one of the functions of the detergent. The surface tension was measured by using a variety of detergents and the hardness of water. The results were evaluated by comparing the numerical values of the properties of the detergent solution. It was understood that the experiments introduced into the class was effective. The educational content related to the detergency is necessary for the following.

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