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The aim of the present study is to elicit students' understanding of the particulate nature of matter via a cross-age study ranging from secondary to tertiary educational levels. A questionnaire with five-item open-ended questions was administered to 166 students from the secondary to tertiary levels of education. In light of the findings, it can be deduced that the number of students' responses categorized under the "sound understanding" category for each item increased with educational level, except for U1. Also, it can be concluded that students' specific misconceptions decreased steadily from SHS1 to SHS3, except for item 4, but there is surprisingly a clear increase at U1.

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