GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Bunsen burner flame, Photo 1 of 2. When a sufficient amount of oxygen is supplied for combustion of propane in a Bunsen burner, the flame has a blue colour. When oxygen supply is reduced, the flame colour shifts to red and its temperature is reduced. Photo 1 of 2.
Model release not required. Property release not required.