Tujuan penelitian ini adalah untuk mengetahui kemampuan pemahaman konsep peserta didik sebelum dan setelah diterapkan model Problem Based Learning berbantuan media simulasi PhET dan apakah terdapat pengaruh yang signifikan model Problem Based Learning berbantuan media simulasi PhET terhadap pemahaman konsep peserta didik SMA Negeri 3 Majene. Metode penelitian yang digunakan adalah Quasi Eksperiment dengan desain The Nonequivalent Control Grup Design. Populasi dari penelitian ini adalah seluruh peserta didik kelas XI MIPA, sampel yang digunakan adalah kelas XI MIPA 1 dan XI MIPA 2 dengan menggunakan teknik pengambilan sampel total. Teknik analisis data yang digunakan terdiri dari analisis deskriptif dan analisis inferensial. Adapun hasil penelitian pemahaman konsep peserta didik pada kelas eksperimen diperoleh rata-rata pretest sebesar 25,07% kategori rendah dan rata-rata posttest 64,52% kategori tinggi, sedangkan pada kelas kontrol eksperimen diperoleh rata-rata pretest sebesar 23,64% kategori rendah dan rata-rata posttest 27,76% kategori rendah. Hasil uji normalitas terdistribusi normal dan uji homogenenitas memiliki varians yang homogen dengan nilai sig. α>0,05. Berdasarkan hasil Uji-T diperoleh nilai signifikan 0,000 yang <0,05. Dengan demikian dapat disimpulkan bahwa terdapat pengaruh yang signifikan model Problem Based Learning berbantuan media
simulasi PhET terhadap pemahaman konsep peserat didik.

The aim of this research is to determine students' ability to understand concepts before and after applying the problem based learning model assisted by PhET simulation media and whether there is a significant influence of the problem based learning model assisted by PhET simulation media on conceptual
understanding of students at SMA Negeri 3 Majene. The research method used was Quasi Experimental with the Non-equivalent Control Group Design. The population of this study was all students in class XI MIPA, the samples used were classes XI MIPA 1 and XI MIPA 2 using total sampling techniques. The data
analysis technique used consists of descriptive analysis and inferential analysis. As for the results of research on students' conceptual understanding in the experimental class, the pretest average was 25.07% in the low category and the posttest average was 64.52% in the high category, while in the experimental control class the pretest average was 23.64% in the high category. low and the posttest average was 27.76%
in the low category. The results of the normality test are normally distributed and the homogeneity test has a homogeneous variance with a sig value. α>0.05. Based on the T-test results, a significant value of 0.000 was obtained, which was <0.05. Thus, it can be concluded that there is a significant influence of the problem based learning model assisted by PhET simulation media on students' understanding of
concepts