Last Updated：2025/11/23
(physics) A system that does not interact with its surroundings. Depending on context this may mean that its total energy and/or momentum stay constant. In thermodynamics, isolated is usually used to indicate that the system's energy does not change. In mechanics it is used to indicate that the system's momentum does not change.
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isolated system
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Source Word
isolated system
Noun
(physics)
A
system
that
does
not
interact
with
its
surroundings.
Depending
on
context
this
may
mean
that
its
total
energy
and/or
momentum
stay
constant.
In
thermodynamics,
isolated
is
usually
used
to
indicate
that
the
system's
energy
does
not
change.
In
mechanics
it
is
used
to
indicate
that
the
system's
momentum
does
not
change.
Japanese Meaning
物理学における「isolated system」とは、外界（周囲）との相互作用が全くない系を指す。つまり、系内部のエネルギーや運動量が外部とのやりとりを行わず、一定に保たれる（熱力学ではエネルギー、力学では運動量が保存される）状態の系である。
Sense（1）
(physics)
A
system
that
does
not
interact
with
its
surroundings.
Depending
on
context
this
may
mean
that
its
total
energy
and/or
momentum
stay
constant.
In
thermodynamics,
isolated
is
usually
used
to
indicate
that
the
system's
energy
does
not
change.
In
mechanics
it
is
used
to
indicate
that
the
system's
momentum
does
not
change.
（ plural ）
