:: Electric discharge in gases is a complicated subject ( there are various different sorts, and the behaviour depends on the geometry of any electrodes as well as the properties of the gas ), but basically it's an electron avalanche ( i . e . answer 1 ).
12.
Silicon has become the most popular material for both high power semiconductors and integrated circuits because it can withstand the highest temperatures and greatest electrical activity without suffering avalanche breakdown ( an electron avalanche is created when heat produces free electrons and holes, which in turn pass more current, which produces more heat ).
