학교 수업 현장에서 활용할 수 있는 표면장력 측정 장치 개발
Development of Surface Tension Measurement Instrument Available in School
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초록
우리나라 화학 교육과정에서 표면장력은 분자 간 상호작용과 함께 지속적으로 제시되어 온 개념이지만, 지금까지 다뤄진 표면장력은 과학적 정의보다는 단순히 현상이나 사례의 측면으로만 제시되는 경향이 있다. 따라서 본 연구에서는 표면장력에 대한 새로운 교수학습 방법을 마련하고자 과학적 정의에 기반을 둔 표면장력 측정 실험 장치를 개발하고자 하였다. 선행 연구에서 제시한 표면장력 측정 장치들의 한계점을 분석하였고, 실험의 직관성, 편리성, 정확성 등에 초점을 맞추어 Wilhelmy 평판법(Wilhelmy plate method) 기반의 표면장력 측정 장치를 개발하였다. 6종 액체의 표면장력을 측정함으로써 제작된 표면장력 측정 장치가 짧은 시간 내에 정확하고 정밀한 값을 측정할 수 있다는 것을 확인하였다. 본 연구에서 제안하는 표면장력 측정 장치는 추후 화학 수업 현장에서 표면장력 교수와 측정을 위해 사용될 수 있다.
Abstract
In the curriculum of chemistry in Korea, surface tension is a concept that has been consistently presented with intermolecular interaction. However, the surface tension till now tended to be presented only as a phenomenon or a case rather than a scientific definition. Therefore, in this study, we tried to develop a surface tension measurement instrument based on the scientific definition in order to provide a new teaching and learning method for surface tension. We analyzed limitations of surface tension measurement instruments proposed in the previous research, and developed a surface tension measurement instrument based on Wilhelmy plate method focusing on intuitiveness, convenience and accuracy. From several measurements of surface tension for six different liquids, it was confirmed that the developed instrument can accurately and precisely measure the surface tension in a short time. The proposed instrument can be used for surface tension teaching and measurement in the future class at school.
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