Surface combustion burners or radiant tile burners in comparison produce nitrogen oxides' levels 60-70% less. Therefore John Joyce's research into low NO x burners revolved primarily around surface combustion techniques. Another issue was the effect combustion temperatures have on the formation of NO x.
soup sandwich. A slang term used by members of the United States Army to describe a fellow soldier whose performance is unsatisfactory. This term is often shortened to just soup.. The term expresses a state of extreme uselessness, which can be understood by considering the functionality and worth of soup between two slices of bread.
Definition of soup. 1  1 : a liquid food especially with a meat, fish, or vegetable stock as a base and often containing pieces of solid food. 2  2 : something (as a heavy fog or nitroglycerine) having or suggesting the consistency or nutrient qualities of soup. 3  3 : an unfortunate predicament that stunt landed her in the soup.