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Old practices of teaching and learning, mainly based on conventional media, offer a very limited resource in explaining a comprehensive concept of physical phenomena. As a consequence, it needs to incorporate a computer simulation which plays an important role in visualizing a wide range of complicated and abstract concepts. This study aims to develop a computer simulation of gas velocity measurement as a learning medium on the subject of Maxwell speed distribution. Measurement of very small and un-naked eye gas particles requires special techniques and tools that involve a complicated process of selecting particles and measuring their speed. For learning purposes, this measurement process needs to be done by computer simulation as in real lab it still face many limitations. This research uses the ADDIE model which includes analysis, design, development, application and evaluation. The results of the simulation show that: the velocity of gas particles passing through gaps ∆y is not a single velocity but has a certain range (v min - v max), a decrease in angle of two gaps and its width causes a decrease in the speed range, data of particle-s number when angular velocity of disks are varied from 0-100 units shows conformity with Maxwell-s velocity distribution graph which was obtained theoretically.