The experiment proves that gas in the stomach can be caused by milk. One of the types of food gas is found in is milk. It is also found in pop, some fruits and candies. When gas gets into your stomach you have to release it. It can be released by the passing of gas or burping. If you ever have a problem with releasing gas you can use some baking soda with water.
http://digestive.niddk.nih.gov/ddiseases/pubs/gas/
http://www.livestrong.com/article/535549-how-to-relieve-trapped-stomach-gases/
http://www.gastro.org/patient-center/digestive-conditions/gas-in-the-digestive-tract
http://digestive.niddk.nih.gov/ddiseases/pubs/gas/
http://www.livestrong.com/article/535549-how-to-relieve-trapped-stomach-gases/
http://www.gastro.org/patient-center/digestive-conditions/gas-in-the-digestive-tract