The concept of gases is difficult to understand. Accordingly, there are many misconceptions on the subject of gases. The purpose of the present study is defining the misconceptions of gases, on reference to the previous studies conducted in Turkey, in order to categorize and study these. The present is a document analysis study. Collected data were analysed through content analysis method. The literature on gases between 2007-2017 was studied. The present study is limited to studies included in EBSCO, TUBITAK Dergipark, YOK (Turkish Board of Higher Education) thesis databases and the papers in the congress that can be reached in electronic media. The focus of the present study while investigating previous studies was on defining the misconceptions of gases and methods of defining these misconceptions. According to the literature on gases between 2007-2017, there are many misconceptions on the subject of gases and these misconceptions were grouped under thirteen categories.