Edema has many possible causes: 1  Prolonged standing or sitting, especially in hot weather, can cause excess fluid to accumulate in the feet, ankles and lower legs. 2  Tiny valves inside the veins of the legs can become weakened, causing a common problem called venous insufficiency.
Cars with nitrous-equipped engines can be identified by the purge of the delivery system that most drivers perform prior to reaching the starting line. A separate electrically operated valve is used to release air and gaseous nitrous oxide trapped in the delivery system.
Nitric Oxide is a colorless gas with a sharp odor. It is the. main component of photochemical smog and occurs as a by-. product of tobacco smoke, and propane, diesel and gasoline. engine exhaust. It is also used as bleaching agent for rayon. and for making Nitric Acid and other Nitrogen compounds.