“…Thermodynamics is a branch of science which examines energy, energy transformations and was determines that they cannot comprehend the difference between different forms of energy and the source of energy, and that they perceive of energy as light, electricity, the sun, technological applications, a characteristic of living beings, and as a means of making life easier, and that there are deficiencies in their mental constructions of energy, source of energy, the form of energy, transformation of energy, and the transference of energy (Çoban, Aktamış & Ergin, 2007;Kaper, & Goedhart, 2002;Kırtak, 2010;Töman & Çimer, 2012;Yürümezoğlu, Ayaz & Çökelez, 2009). In addition to all these, it was revealed in other studies that energy, conservation of energy, and transformation of energy are among the concepts that should be taught to students in a world where science and technology advances rapidly (Benzer, Bayrak, Eren & Gürdal, 2014;Çoban, Aktamış & Ergin, 2007;Yürümezoğlu, Ayaz & Çökelez, 2009). Taking its cue from this, this study aims to determine the conceptual comprehension of pre-service physics teachers, who have taken thermodynamics course.…”