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.
Summary: 1.Soup is a liquid food preparation which contains small amounts of solid ingredients and more liquid while stew is a food preparation which contains less liquid and more solid ingredients. 2.Soup is served before a meal or as a dessert while stew is a main course.