The aim of the Project is to determine the intelligibility of substance or CO₂ which is existed in the environment. As a result of this experiment: • The environment which is available CO2 • Burning of the paper • Burning of the cardboard • Smoking atmosphere • Burning of plastic • Combustion of coal • Combustion of wood provide CO₂ to the air better and easily. When it burns, the substance of CO₂ comes out. CO₂ gases from each item differently occurs. Thus, as CO₂ gas in the air will be different, it is sometimes perceived and sometimes is not detected. In this study, is it understood that CO₂ is filled with the aid of the air pump into the flask or is something not understood? At the end of measurements, it provided the intelligibility of working status of the device at that time.