Students' understanding of atmospheric pressure concept was investigated by using the questionnaire method. The results indicated that students' understanding of atmospheric pressure concept was superficial and very various. Despite students' correct answers, their understandings are partial and they have many misunderstandings which are often associated with scientific terms. Especially many students didn't understand the method of measurement, definition and the reason of variation with altitude of atmospheric pressure. The implications of these findings for science teaching are discussed.

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