I am considering the cathode ray tube of the set up, when the cathode rays were discovered

Voltage = Very High
Gas = any
Atmospheric Pressure = We change

(In the following example i am just changing the atmospheric pressure everything else is kept same)

At
1 atmospheric pressure (atm) -> Tube Does not glow
0.1 atm -> The whole tube lightens
0.01 atm -> The tube glows at the anode end (Glowing is shown as there is a detector coating of ZnS)

[Note: I don't have this set-up this is just taken by me from theory]

My Question: why when i am just reducing the atm from 1 to 0.01 first it is not glowing then it glows completely and after that it glow just at one end. Why so?

I am considering the cathode ray tube of the set up, when the cathode rays were discovered:

• Voltage = very high
• Gas = any
• Atmospheric Pressure = changing

At different pressures, there are different observations:

• 1 atm: the tube does not glow.
• 0.1 atm: the whole tube lightens up
• 0.01 atm: the tube glows at the anode end (Glowing is shown as there is a detector coating of ZnS.)

Note: I don't have this set-up, this is just taken by me from theory.

Why does, when I am just reducing the pressure from 1 atm to 0.01 atm, the tube at first not glow, then it glows completely, and only at low pressure it glows just at one end?

Why does the cathode ray tube glow at 0.1 atmospheric pressure and does not glow completely at 0.001 atmospheric pressure if only it has some luminescence at the anode? According to what I saw, at normal pressure it does not glow, but if you decrease the pressure all its volume glows and further pressure decrease leads to reduction of its glow. Why it is so? If with pressure deacrease it glows more it should glow even brighter at 0.01 atm.... What is the reason?

I am considering the cathode ray tube of the set up, when the cathode rays were discovered

Voltage = Very High
Gas = any
Atmospheric Pressure = We change

(In the following example i am just changing the atmospheric pressure everything else is kept same)

At
1 atmospheric pressure (atm) -> Tube Does not glow
0.1 atm -> The whole tube lightens
0.01 atm -> The tube glows at the anode end (Glowing is shown as there is a detector coating of ZnS)

[Note: I don't have this set-up this is just taken by me from theory]

My Question: why when i am just reducing the atm from 1 to 0.01 first it is not glowing then it glows completely and after that it glow just at one end. Why so?

Why does the cathode ray tube glow at 0.1 atmospheric pressure and does not glow completely at 0.001 atmospheric pressure rather just have some fluorescence at the anode? According to me see at first at normal pressure it does not glow then if you decrease the pressure all of it glows and then if you decrease the pressure only some part of it glows, why? if with decreasing pressure it glows more it should glow very bright at 0.01.... What is the reason?

Why does the cathode ray tube glow at 0.1 atmospheric pressure and does not glow completely at 0.001 atmospheric pressure if only it has some luminescence at the anode? According to what I saw, at normal pressure it does not glow, but if you decrease the pressure all its volume glows and further pressure decrease leads to reduction of its glow. Why it is so? If with pressure deacrease it glows more it should glow even brighter at 0.01 atm.... What is the reason?