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.
soup - liquid food especially of meat or fish or vegetable stock often containing pieces of solid food. pot likker, pot liquor, liquor - the liquid in which vegetables or meat have be cooked. beef broth, beef stock - a stock made with beef. chicken broth, chicken stock - a stock made with chicken.