Answer:
Neon tubes are capped off by two glass electrodes that have wire passing from outside to inside. One of these electrodes has tubulation - a small tube which remains as a passage from outside to inside. Tubulations are sealed to a pumping system. The pumping system has glass stopcocks or valves that allow sections to be selectively opened or closed. An ultrahigh vacuum pump pulls air out of the tube while a high voltage transformer bombards and heats the remaining air - to produce temperatures in excess of 500ºF. This allows the tube to achieve a higher degree of purity. When a high vacuum is reached, and the tube begins to cool, a small amount of inert gas is introduced from a flask or a tank of pressurized gas. The tubulation is then heated and as it is pulled it such inward to make the tube's own seal. and wxngdygbu3gnxc32