Last Updated：2025/11/20
A hypothetical creature created for a thought experiment. Maxwell’s demon, if it existed, would act as a sort of gate guard by sorting between higher-energy molecules and lower-energy molecules within an enclosed space. Because such a sorting process would tend to decrease entropy, it would violate the second law of thermodynamics.
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Maxwell's demon
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Source Word
Maxwell's demon
Noun
A
hypothetical
creature
created
for
a
thought
experiment.
Maxwell’s
demon,
if
it
existed,
would
act
as
a
sort
of
gate
guard
by
sorting
between
higher-energy
molecules
and
lower-energy
molecules
within
an
enclosed
space.
Because
such
a
sorting
process
would
tend
to
decrease
entropy,
it
would
violate
the
second
law
of
thermodynamics.
Japanese Meaning
思考実験のために考案された仮想的な存在。 / 閉じた空間内で、高エネルギー分子と低エネルギー分子を選別する門番のような役割を持つ。 / この仕分けプロセスによってエントロピーが減少し、熱力学第二法則に反するというパラドックスを示す。
Sense（1）
A
hypothetical
creature
created
for
a
thought
experiment.
Maxwell’s
demon,
if
it
existed,
would
act
as
a
sort
of
gate
guard
by
sorting
between
higher-energy
molecules
and
lower-energy
molecules
within
an
enclosed
space.
Because
such
a
sorting
process
would
tend
to
decrease
entropy,
it
would
violate
the
second
law
of
thermodynamics.
（ canonical ）
（ plural ）
