gases conduct electricity at low pressure,why?

Question

please answer in detail.

Answer 1

Suppose that you have gas under low pressure, with an electrostatic field applied. If an atom of the gas is ionized by some means, it will drift toward the negative electrode, with a speed that increases the farther it falls (just like a rock under gravity). At some point, it will collide with another atom, and by the time it does so, it will - or will not -- have acquired enough energy from the electrostatic field to ionize the target atom. If it does, the current will increase; if it doesn't, it will kick the target and lose much of its own energy in the process. If the target is ionized, the process can accelerate in a chain reaction, and the current will increase rapidly until it runs into some sort of limit which is typically imposed by the external circuitry. Bottom line: if the pressure is too high, the mean free path is too short for ionization to occur; if it is too low, there are not enough gas atoms to carry the current.

Answer 2

Electricity is the flow of electrons from negatively to positively charged ends. At normal pressure in a gas, electrons collide with gas molecules present and are absorbed by them. so they can't flow to the other end. at low pressure number of gas molecules present are less and an appreciable number of electrons flow to the opposite end, producing electricity.

Answer 3

maybe it`s because gas electrones is easier to move

Answer 4

Thats is one cool ? asked by one cool ?ner.