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Gas-filled tube
A
gas-filled tube
, also known as a
discharge tube
, is an arrangement of
electrodes
in a
gas
within an
insulating
, temperature-resistant
envelope
. Gas-filled tubes exploit phenomena related to
electric discharge in gases
, and operate by
ionizing
the gas with an applied
voltage
sufficient to cause
electrical conduction
by the underlying phenomena of the
Townsend discharge
.
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