A burping bottle intrigues students from the onset of this lesson. The burping bottle represents a mini-biogas digester which contians manure, water, and paper. As the bottle sits for a few days the microbes in the manure breakdown the paper in the bottle and produce methane gas as a byproduct. Hence the burping affect observed when the bottle caps are unscrewed and the methane is released.

Students have the opportunity to design their own experiments with the burping bottles as they try to increase the rate at which the microbes produce methane gas. Exploring the sites and sounds of the burping bottles allows for a teachable moment about aerobic and anerobic respiration while practicing process skills associated with Biology I.