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.
General Information. Nitrous Oxide (N2O) (âNitrousâ) is a colorless, nearly odorless, non-flammable gas first synthesized in the 1700âs (4).It was not widely used medically until the mid 1850âs and was introduced as an analgesic for dental procedures (4).eneral Information. Nitrous Oxide (N2O) (âNitrousâ) is a colorless, nearly odorless, non-flammable gas first synthesized in the 1700âs (4).