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.
We see it all the time with part-time racers and street runners who want to go fast but may not understand the basics about pressurized gases. Weâll start with the nitrous in the bottle. A full bottle at room temperature (72 degrees F) will be at 760 psi, and most of the nitrous oxide will be in a liquid state. Below this pressure, nitrous will begin to phase change from a liquid to a gas, which is less dense.