We developed teaching materials on environmental education using computer measurement with a handmade colorimeter. In this study, we examined the use of suspended particulate matter (SPM) in the air as teaching materials. We firstly developed a simply manufactured suction pump and a reflection-type colorimeter to measure the SPM quantitatively. Subsequentry, we conducted a practical science class in the junior high school by using the newly developed teaching materials. The result shows that these teaching materials are effective for inquiry activities on environmental education. Also, students can be expected to improve their awareness of environmental preservation and environmental problems through experiencing these measurement activities. Moreover, in a survey of the effective aspect of the students' experience, the result obtained was that approximately 90% of the students thought that the activity was enjoyable or slightly enjoyable.
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