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.
Gas Phase: Belgium, Czech Republic, France, Germany, Netherlands, Poland, Portugal, Slovakia, Spain, United Kingdom. Liquid Phase: Belgium, France, Portugal, Spain. Medicinal Nitrous Oxide is a Medicinal gas. It's used as an inhalant anesthetic and analgesic drug associated to other anesthetic agents and oxygen. The nitrous oxide complies with the European Pharmacopoeia.