Last Updated
：2025/11/21
spark plug
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(military)
A
rod
(for
cylindrical
secondaries)
or
sphere
(for
spherical
secondaries)
of
fissile
material
at
the
center
of
the
secondary
of
a
multistage
thermonuclear
weapon,
which
undergoes
nuclear
fission
when
compressed
to
supercriticality
by
the
imploding
secondary,
helping
to
raise
the
secondary
to
the
pressures
and
temperatures
necessary
to
ignite
nuclear
fusion
in
the
secondary's
fusion
fuel.
（ plural ）
Quizzes for review
The part of an internal combustion engine which forms a high-voltage electric spark which ignites the fuel-air mixture to begin the power stroke.
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spark plug
I replaced the spark plug yesterday to fix the misfire and restore engine performance.
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I replaced the spark plug yesterday to fix the misfire and restore engine performance.
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