Last Updated：2025/11/21
(physics, meteorology) a widespread body of air, the properties of which can be identified as: (a) having been established while that air was situated over a particular region of the Earth's surface (airmass source region) and (b) undergoing specific modifications while in transit away from the source region. An air mass is often defined as a widespread body of air that is approximately homogeneous in its horizontal extent, particularly with reference to temperature and moisture distribution; in addition, the vertical temperature and moisture variations are approximately the same over its horizontal extent.
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airmass
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Source Word
airmass
Noun
(physics,
meteorology)
a
widespread
body
of
air,
the
properties
of
which
can
be
identified
as:
(a)
having
been
established
while
that
air
was
situated
over
a
particular
region
of
the
Earth's
surface
(airmass
source
region)
and
(b)
undergoing
specific
modifications
while
in
transit
away
from
the
source
region.
An
air
mass
is
often
defined
as
a
widespread
body
of
air
that
is
approximately
homogeneous
in
its
horizontal
extent,
particularly
with
reference
to
temperature
and
moisture
distribution;
in
addition,
the
vertical
temperature
and
moisture
variations
are
approximately
the
same
over
its
horizontal
extent.
Japanese Meaning
大気塊：特定の地域上空で生成され、その地域の空気が持つ温度や湿度の性質が水平的にほぼ均一な広範囲の空気の塊。
Sense（1）
(physics,
meteorology)
a
widespread
body
of
air,
the
properties
of
which
can
be
identified
as:
(a)
having
been
established
while
that
air
was
situated
over
a
particular
region
of
the
Earth's
surface
(airmass
source
region)
and
(b)
undergoing
specific
modifications
while
in
transit
away
from
the
source
region.
An
air
mass
is
often
defined
as
a
widespread
body
of
air
that
is
approximately
homogeneous
in
its
horizontal
extent,
particularly
with
reference
to
temperature
and
moisture
distribution;
in
addition,
the
vertical
temperature
and
moisture
variations
are
approximately
the
same
over
its
horizontal
extent.
（ plural ）
