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This study aims to determine the effect of problem based learning models on student-based argumentation skills on heat to electricity conversion nature. The population of this research is all students of XII SMA Negeri 4 Bandarlampung. The selection of research samples using purposive sampling technique with a sample of class XII Science 3 totale sample are 30 students as an experimental class. The research design used was One Group Pretest-Posttest Design. Data were tested by N-gain analysis, normality test, and Paired Sample T-Test. Based on research conducted, using the Paired Sample T-Test, the Sig. (2-Tailed) is less than 0.05 which is 0,000, so it can be stated that there is an influence of problem based learning models on practicum-based student argumentation skills in the method of converting heat to electricity. The average N-gain (g) of argumentation skills in the experimental class is 0.80 with a high category. Based on the results of student argumentation tests show that 89.5% are categorized as Claims, namely students are able to express their opinions in written form based on the understanding of the questions given, 83.0% are categorized as Data, ie students understand the questions given so that they can write down any information based on the knowledge they know, 80.2% is categorized as a warrant, ie students are able to explain the relationship between Data and Claims. This shows that the problem based learning model is very effective and has a big impact on the improvement of argumentation skills. The problem based learning model can improve students' argumentation skills. 

The Effect of Problem Based Learning Models on Practicum Based Argumentation Skills on Heat to Electricity Conversion Material