<![CDATA[This study purpose to describe students’ conceptual mastery and knowing the students' difficulties understanding on heat and temperature. This survey research was conducted on 11th grade of mathematic and natural science class in senior high school students. Data was obtained through reasoned multiple choice questions of conceptual mastery. We found that only 54.8% of students had good conceptual mastery. This shows that students' conceptual mastery is low on heat and temperature. In addition, we found three student’s difficulties, namely: (1) cannot distinguish definition of heat and temperature, (2) don’t know factors that can affect temperature changes and phase changes, and (3) unable to solve heat transfer problem. It is expected that future study can improve students' conceptual mastery through application of appropriate learnings.]]>
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