Abstract
This paper examines the ways in which the physics teachers solve a multifaceted real-world problem that relates to the behavior of gas. The participants consist of 30 physics teachers of senior high schools in East Java. Most of them have had 20 years or more experiences in teaching physics. They discussed the problem in a group of 3-4 teachers. This study shows that no teacher succeeded to solve the problem. In solving such problem, most teachers relied on the surface feature of the problem and employed a common sense argumentation: no teacher used diagram or equations, no teacher referred to Newton laws of motion or state equation PV = nRT. Therefore, it is critical that Physics Education Program should provide their prospective physics teacher the opportunities to acquire a deeper content knowledge and enough experiences in solving multifaceted real-world problems.