Last Updated：2025/11/21
(physics, meteorology) An imaginary body of air to which may be assigned any or all of the basic dynamic and thermodynamic properties of atmospheric air. A parcel is large enough to contain a very great number of molecules, but small enough so that the properties assigned to it are approximately uniform within it and so that its motions with respect to the surrounding atmosphere do not induce marked compensatory movements. It cannot be given precise numerical definition, but a cubic foot of air might fit well into most contexts where air parcels are discussed, particularly those related to static stability.
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air parcel
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Source Word
air parcel
Noun
(physics,
meteorology)
An
imaginary
body
of
air
to
which
may
be
assigned
any
or
all
of
the
basic
dynamic
and
thermodynamic
properties
of
atmospheric
air.
A
parcel
is
large
enough
to
contain
a
very
great
number
of
molecules,
but
small
enough
so
that
the
properties
assigned
to
it
are
approximately
uniform
within
it
and
so
that
its
motions
with
respect
to
the
surrounding
atmosphere
do
not
induce
marked
compensatory
movements.
It
cannot
be
given
precise
numerical
definition,
but
a
cubic
foot
of
air
might
fit
well
into
most
contexts
where
air
parcels
are
discussed,
particularly
those
related
to
static
stability.
Japanese Meaning
物理学や気象学において使用される概念で、空気の基本的な動的および熱力学的性質がほぼ均一であると仮定される、仮想的な空気の塊を指す。これは、非常に多くの分子を含む一方で小さすぎず、内部の性質が均一であり、かつ周囲の大気との相対的な運動に大きな補償的変化を引き起こさない程度のサイズで考えられるものです。
Sense（1）
(physics,
meteorology)
An
imaginary
body
of
air
to
which
may
be
assigned
any
or
all
of
the
basic
dynamic
and
thermodynamic
properties
of
atmospheric
air.
A
parcel
is
large
enough
to
contain
a
very
great
number
of
molecules,
but
small
enough
so
that
the
properties
assigned
to
it
are
approximately
uniform
within
it
and
so
that
its
motions
with
respect
to
the
surrounding
atmosphere
do
not
induce
marked
compensatory
movements.
It
cannot
be
given
precise
numerical
definition,
but
a
cubic
foot
of
air
might
fit
well
into
most
contexts
where
air
parcels
are
discussed,
particularly
those
related
to
static
stability.
（ plural ）
