The aim of this study is to provide knowledge about how preschoolers discuss about carbon dioxide bubbles and its buoyancy. To answer the study´s questions, three focus groups with a total of twelve children and six group interviews with a total of eight children, have been used as a method. In the implementation of the focus groups and the group interviews, the experiment dancing raisins was used. The experiment was used as a concrete material to make the carbonic acid visible to the children. A social constructivist perspective has been used during the analyzes of the data. From the keywords that emerged during the analysis, nine categories have been identified and divided to answer the questions of the study. The result shows that when the children were to describe the carbonic acid, they used the words bubbles and bubble water. Only one child said the word gas, but none of the children used the word carbonic acid. The result also shows that the children in the study have previous experiences that the appearance and characteristics of objects affect whether they float or sink. The result shows that the children mainly used everyday concepts and lack scientific concepts when describing the phenomenon. The result of the study can contribute to a developed chemistry teaching in the preschool, by letting preschool teachers know what words children use to describe a phenomenon and thus adapt the chemistry content of the preschool.