Children are very familiar with water, ice, and steam as these things have been part of their lives since they first crawled into the kitchen. In this study children's conceptions about familiar phenomena associated with water, e.g., evaporating, condensing, boiling, and the melting of ice, were investigated using a clinical interview technique. The prevalence of specific views at particular age levels was also studied. The results of the investigation indicate that children do have ideas about the changes of state of water which are quite different from the views of scientists. It would also appear that these ideas can sometimes be influenced in unintended ways by science teaching. The implications of these findings for teaching are discussed.

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