Discovering e/m Ratio: The J.J. Thomson Experiment Explained

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M. next
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This experiment aims towards finding e/m ratio and it is a very well known experiment that's why I will directly post my question. Why do we evacuate the glass tube?
 
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electrons would be easily stopped in a tube containing gas.
 
M. next said:
Why do we evacuate the glass tube?
The better the vacuum, the better the electrons can travel unimpeded by collisions with gas molecules. A beam of electrons won't get far in air before being scattered.
 
Uh, I see.. Great thanks.
 

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