CONDUCTION THROUGH GAS
The flow of charge particle in a material medium is known as electric induction. Atmospheric gas is electrically neutral. Although the gas contain many more positive ions and free prawns they move randomly and Recombine frequently So they do not produce any specific pattern of flow of charged particles. if strong electric field is applied using electrodes of high potential difference in the presence of low pressure of gas positive ions are drawn to the negative terminals and the negative charged particles are drawn towards the positive terminals. this movement of charged particle produces a current through which is known as ionizing current. the passage of current so produced in presence of high potential difference and low pressure is called the electric discharge through a gas. Depending upon several factors the discharge may radiate visible light.
Electric charge phenomena can be observed in a special type of device called the discharge tube. discharge tube consists of a glass tube with two electrodes are maintained at high potential difference at two ends of the tube length about 50 centimetre and diameter 3 cm to 5 CM. It is also provided with the pressure of gas inside it in the pressure gauge to measure the pressure in it when the pressure of gas is produced when discharging appears in the form of light.
At low pressure and high voltage the ions in the gas collide with the other gas molecules in the discharge tube due to this collision the electrons are excited to higher energy state but the excited electrons De excite in very short interval of time emitting the visible light.
The patterns of visibility in the tube are different at different pressure at low pressure dark space may we produce into the tube they are called Faraday's dark space it really such type of dark space are produced when discharging electrons travel through the positive ion clouds in space positive and clouds the speed of moving electrons drastically decrease and cannot Exide the gas molecules hence the dark space are formed at the reason of tube for the more no discharging phenomenon occurs at very low pressure, since there is very less number of gas molecules to be excited.
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