In STEAM education the fields of science, mathematics, engineering, art and technology are taught by integrating these fields in a holistic way instead of teaching them separately. However, preparing STEAM activities that helps actualizing students’ learning in terms of concepts, principles and actions related to science classes is a difficult process. This study involves a STEAM activity prepared as a sample that can be used in teaching and learning process. The activity prepared was implemented to 7th grade middle school students composed of 37 participants. Before and after implementation, a questionnaire that was composed of three open ended questions was applied in order to determine how the activity is effective. As a result of the implementation, it was concluded that the activity developed was effective in students’ learning in the science topic entitled as conservation of energy. For this reason, it is thought that the activity prepared about the conservation of energy topic in which students have a lot of misconceptions will be a useful class activity that can improve students’ meaningful learning. Besides, it can also be used as a practical teaching design that can easily be used in crowded classes.