Since the viscous behaviour of liquids is evident in many everyday situations, it is plausible to assume that students have (pre-)conceptions about the physics behind these phenomena. As yet, no reliable studies exist on this topic. Therefore, the present study aims to address this research gap by exploring secondary school students’ conceptions about the viscous behaviour of liquids. For this purpose, we conducted structured interviews with 12 ninth grade students, in which the students were asked to describe and explain various viscosity phenomena of everyday life, presented to them as video clips. Our analysis of the interviews revealed that many of the students have the conception that density is associated with viscous behaviour. In addition, some students explain viscous behaviour with reference to the ingredients of a liquid or by its stickiness or compression. Further, both macroscopic- and sub-microscopic-level explanations for the viscous behaviour of liquids emerged in the interviews.

由于液体的粘性行为在许多日常情况下都很明显，因此可以假设学生对这些现象背后的物理学有（预先）构想。到目前为止，还没有关于该主题的可靠研究。因此，本研究旨在通过探索中学生对液体粘性行为的观念来解决这一研究空白。为此，我们对12名九年级学生进行了结构化访谈，其中要求学生描述和解释日常生活中的各种粘滞现象，并以视频片段的形式呈现给他们。我们对访谈的分析表明，许多学生都认为密度与粘性行为有关。此外，一些学生参考液体的成分或通过其粘性或压缩来解释粘性行为。此外，在访谈中还出现了对液体粘性行为的宏观和亚微观层面的解释。