Last Updated
：2025/11/20
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 ）
Quizzes for review
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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See correct answer
Maxwell's demon
In the lecture, the professor used Maxwell's demon to illustrate how sorting molecules by energy would seem to decrease entropy and challenge the second law of thermodynamics.
See correct answer
In the lecture, the professor used Maxwell's demon to illustrate how sorting molecules by energy would seem to decrease entropy and challenge the second law of thermodynamics.
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